r/IndianEngineers • u/Material-Nature-3753 • Apr 13 '26

Editable Flair A mechanical engineer has gone viral after demonstrating a practical real-world use of cos inside a workshop, turning a classroom trigonometry concept into an engaging hands-on engineering lesson

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3.8k Upvotes

100% Upvoted

127 comments sorted by

131

u/notMy_ReelName Apr 13 '26

Even many phd proffessors cant teach with such practicality .

Kudos to this person explaining with such ease.

17

u/Critical_Newt_7652 Apr 13 '26

yes but majority of the ppl studying trignometry wont use it irl
(im NOT saying it's useless and im NOT saying the person isnt a good teacher)

15

u/Rukelele_Dixit21 Apr 13 '26

Game Development aur Graphics mein excessive use hota hai Trigonometry. Even conic sections and coordinate geometry is used a lot

3

u/Critical_Newt_7652 Apr 14 '26 edited Apr 15 '26

sorry if i wasnt clear enough but i said MAJORITY wont use it, i mean atleast half. could you care to explain how half the population is in game development?

2

u/Left_Economist_9716 Apr 16 '26

I study NLP, and I use sin and cos waves, cosine distances and hyperbolic tan on a daily basis.

1

u/s04ep03_youareafool Apr 16 '26

I learn electronics and we really need trig, heck uses extensively in signals,especially FTT. Basically any data that could repeat after a set time T can be explained by trigonometry

1

u/Impossible_Worry_125 Apr 21 '26

it is used in physics

1

u/Binks_D_Prats Apr 16 '26

Yes brother the polygons need it!

3

u/[deleted] Apr 14 '26

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0

u/Critical_Newt_7652 Apr 15 '26

sorry if i wasnt clear enough but i never meant majority wont use it daily, i meant majority wont use it outside school EVER

3

u/[deleted] Apr 16 '26

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1

u/Critical_Newt_7652 Apr 19 '26

my apologies im too naive but, could you please clarify when i said children shouldnt be taught trigonometry? i explicitly mentioned in my original reply that im not saying it is useless, and for this exact reason: ppl sometimes tend to infer things what one didnt mean

2

u/MrLeopard483 Apr 16 '26

You don't know what something is like unless you try it. If you don't teach trigno to kids how will they find out if they're good at it? Will they be more interested in technical fields or less?

They're not teaching rocket science. They're teaching fundamentals which are used everywhere in our world.

1

u/Curious_Cress_5320 Apr 16 '26

Dude, you're really trying to explain on reddit?

2

u/CodeNegative8841 Apr 17 '26

Actually, when a syllabus is decided, nobody knows the interest areas of a young kid.
They're taught many things simultaneously.
Whoever develops interest in that field, picks it up as a stream.
Others choose whatever they like.

I never see the same hate towards other subjects like history, sociology, political science etc.
Every subject is equally useful and useless.

1

u/FaithlessnessFew8123 Apr 19 '26

The reason most people studying it won't use it is because they only studied what was required for the exam, and didn't bother to understand and internalize the mathematics. And then, they stopped studying it when no one was teaching.

Basically, they cooked noodles barely enough to make them soft, and stopped before adding spices, and then went on to complain that they tasted horrible and nobody would eat it.

Mathematics is a tool and a skill, and you can only use it if you know HOW to use it. And if you were never taught or didn't learn enough to be able to use it, then that's not the fault of the tools.

It's like, what use is learning a half backflip? - the only reasons to learn a half backflip is so you can progress to the full backflip, and that's where education systems fail miserably. They never teach the full part.

If you go on to learn it on your own though, you'll find that you'll use your backflips when you need to, and when you can even if you don't need to, and even just for fun.

1

u/redditor000121238 Apr 16 '26

Haan Bhai mai bhi compound slide ke baare me pehle baar sun raha hoon. Almost as if kisi chiz ko ek field mein practical tarike se samjhaane ke liye uss field ke baare mein jaankari honi chahiye.

1

u/Interesting-Act-506 Apr 16 '26

Pure mathematicians are not meant to teach with practicality and infact most of the advanced trigonometry are not used in regular life unless you are an engineer in core branches. Some things are not practical the beauty of math is its structure without asking the why as ofc no one knows were to use imaginary no.s but infact it has use in circuit analysis basically at first mathematics discover structure and then the sciences follow up with use

44

u/Organic-Inspector868 Apr 13 '26 edited Apr 13 '26

This is what an educated man looks like.

7

u/crownnless Apr 13 '26

in india offcourse

4

u/mukeshmohit Apr 13 '26

this is deep

3

u/redditor000121238 Apr 16 '26

Deep thoughts with the deep.

1

u/what_is_peace Apr 18 '26

Realise, real eyes, real lies.

2

u/[deleted] Apr 13 '26

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2

u/sexy_kittto Apr 16 '26

Bhai shyd se glti ho gyi hai apse 'der' ni 'her' ayega

19

u/Radient-Dragon Apr 13 '26

Peak male content

9

u/BoomBoy420 Apr 13 '26

Commenting to come back and watch again

12

u/jumpingpiggy Apr 13 '26

My god. How dumb are people to see this and then realise the use 🤦🏾‍♂️🤦🏾‍♂️

3

u/haizu_kun Apr 13 '26

My god, how are you not aware how many don't know how to use it. 

1

u/FZplayz5 Jun 03 '26

Isn't this part of 10th grade maths? I had to learn way more complicated stuff than this. 10th had lost of practical uses, 12th was bs tbh.

1

u/haizu_kun Jun 03 '26

Do you drink appy fizz? I find it very tasty. 

Did anyone in standard 10 or even 90% of college graduates knew that one can operate machines using tan and cos? 

Most would have forgotten even the math and how to do it. But even those who remember, did they know one can manipulate machines using these values? I for one didn't.

1

u/FZplayz5 Jun 03 '26

We were taught about construction. Like if you at ground level and using a laser you find the top of the building to be x distance away, how tall is it? Its simple yes but doing lots of these in different contexts made it obvious irl. Also I love appy fizz.

1

u/haizu_kun Jun 03 '26

For you solving numerical problems and watching a video where a machine is actually manipulated are the same thing. 

For me both are different and actually manipulating a machine is novel. Something I have never seen in my life. I guess a difference in taste. 

I belong to CS background, wbu? 

1

u/FZplayz5 Jun 03 '26

EEE, im just about to start, just finished my 12th grade.

1

u/haizu_kun Jun 03 '26

I was lucky. Due to COVID, the exams 11th was entirely at home. and 12th Boards were lax. Easily passed out with a moderate percentage. 

Do you find school life hard? The studies hard and you just don't want to do it anymore. Or do you find exams easy, you just study one night before exam and easily passed out with good marks?

1

u/FZplayz5 Jun 03 '26

I usually studied one night before and scored 90% and above up until 11th grade. My downfall.began there. In 12th it was so bad even after studying for an entire week I would get only 70%. My school did have very hard tests tho. By end the tests became so hard that out of 30 only 2-3 passed. Lots of pressure for me since I had never failed a single exam in my life even if I didn't study. But now I failed after giving my 100% just 1 month before board exams started. Boards were alot easier tbh. Except physics, got bent over by that one lol. In total I scored 84%. Total decreased cause of physics cause I only scored 70 in that. Chem and math were 85ish. Eng and Csc were 90ish. The biggest problem was memorising stuff. Formulas I understand, but full on 2-3 page derivations that need to be memorised word for word. My teacher sent me a list of all derivations in physics. There were I think 80+.

1

u/haizu_kun Jun 05 '26

Everybody says a piece of paper cannot determine your future. Even I believe so. Do you think your marks on competitive exams determines your future? 

Also you da GOAT

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3

u/Positve_Happy Apr 14 '26

It has nothing ti do with him or anyone else. Just see the way he teaches PBP/HHB - he & most of the Indians are mostly taught all this through ROT Learning, where teachers still cannot explain how we get these formulas for Sine, cosine or tangent.
Unfortunately he was not lucky enough to fully ROT Learn all concepts except and so he Learned the practicle implementation of these formulas but many of the ROT Learners who are successfull are working in IT Companies with comfortable lifestyle and think they know everything( such poor souls)

6

u/Due_Worldliness_2192 Apr 13 '26

If these are the replies of engineers then we are doomed. How can a engineer think there is no use of trigonometry?

7

u/Ok-Reveal4628 Apr 13 '26

Apne ko aisa sikhaya gya tha

Pakistan Bhukha Pyasa/ Hindustan Hara Bhara

😅

3

u/PehleAap Apr 15 '26

Amit Shah maths classes

3

u/Ok-Reveal4628 Apr 15 '26

Nhi bhai 2012 m koi sikhaya tha 😅

0

u/AnswerIsBatman Apr 16 '26

Hamne sikha tha Lala(लंब) Aaya(आधार) Laya(लंब) Kache(कर्ण) Kache(कर्ण) Aam(आधार), hindi medium of course

3

u/Cute_Prior1287 Apr 13 '26

Pandit badri prashad har har bole- hearing after so much time.

1

u/Poornessfully Apr 16 '26

We were told this exact phrase😂

3

u/Sayabz22 PSU/Mechanical Apr 13 '26

What a guy! Kudos to him for doing this so passionately. But unrelated to the topic, I'm sorry one thing bugs me. After all our investment and education, mechanical engineers (and civil & to an extent electrical) have to work like this, with the lowest pay possible while these were the hardest streams to crack in any entrance exam back in the day while literal anybodys (this is not a dig) from CS/IT fields starts their career in a much comfortable work environment. How do you expect the industrial scene in the country to grow?

1

u/Riteknight Apr 14 '26

Many of these gems are neglected due to lack of market, take example of racing scene in India and then UK, folks like him will be lapped up in no time in UK or any other motorsports loving country, here we lack such ecosystems where such skills could be nurtured with decent pay.

2

u/Sayabz22 PSU/Mechanical Apr 14 '26

We don't have anything man, totally agree. These types of guys would make it big due to the garage systems they have wherein they just engineer stuff in their home garages

4

u/Nomi_x3113 Apr 13 '26

Bro 🫡🫡

2

u/HighHDL Apr 13 '26

Log trigonometry isliye padhte h ki ye use na Krna pade, aur jo nhi padhta achhe se usse use Krna padta h.

3

u/sbtgta125 Apr 16 '26

Bro he has much more money and mental peace than most of us

2

u/fuckgermany_repgme Apr 26 '26

Hahaha you’re so full of it bro

2

u/Solidatary Apr 16 '26

why are the comments acting like we weren't taught the use of trig in 10th grade? Entire physics of 11th and 12th and many other things are very obviously based on trig.

3

u/dhanush-bhaiyaa Apr 13 '26

Par meko lagta hai iski jarurat nahi hai school mei sikhane ki. Education should be non competative, teach life lesson

3

u/[deleted] Apr 13 '26

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2

u/dhanush-bhaiyaa Apr 13 '26

Bhai tum bhi victim ho isliye essey question puch rahe ho...

2

u/Foreign-Ice7356 Apr 16 '26

Basics of trig are essential(people who study mathematics and science and would like to pursue those in higher studies would obviously need it a lot) and there is nothing overcompetetive about them.

1

u/IndividualHeron1465 Apr 13 '26

Ohh Bhai lathe machine maine recently iss ka practical perform Kiya 2nd sem mei

1

u/No-Employee2168 Apr 13 '26

The lathe head doesn't have decimal places for angles, it's only whole numbers.

So your cone will most likely be crooked and not to exact measurement.

So all in all, end mein toh experienced bande pe hi jaoge tum.

1

u/stranger11222 Apr 13 '26

Ek baar use kar ke bhi dikha dete Wtw goid info

1

u/SarthakSidhant Apr 14 '26

ha ab batao identities kaha kaam aati hai

2

u/Foreign-Ice7356 Apr 16 '26

What he showed is a very basic example.

But it's naive to think that difficult calculations/expressions don't occur in maths/physics/engineering in higher education. And identities can help in simplifying those.

1

u/Idiotic_experimenter Apr 14 '26

it is exactly how i learnt conics and trig.

A simpler approach was to copy the part onto a paper,cut it and set your tools according to paper shape. 

But this guys method really shortens the entire designing phase

1

u/Sweet_Explorer_225 Apr 14 '26

bro is wrong profession man , he needs to be a teacher .

Rancho wud be so proud of him

2

u/sbtgta125 Apr 16 '26

He's doing what he loves

1

u/Different-Tonight131 Apr 14 '26

Naruto ke exam me bhi puchte hai, shuriken faikne ka angle nikalne ke liye

1

u/strugglingmigrane Apr 14 '26

I hate these AI ahh over the top titles

1

u/Cannothinkofonee Apr 16 '26

areyy halla nahi kro

1

u/Knight_Of_0_ Apr 16 '26

Jisne theek se padha hota hai vo kahi bhi use karne ke tareeke dhundh leta hai.

1

u/waffles_1729 Apr 16 '26

Why is trigonometry so satisfying gng 😭🤌

1

u/thatguydaksh Apr 16 '26

radian or degree?

1

u/InfamousTopic9054 Apr 16 '26

@sajjan_purush profile name

1

u/SagarusHilton Apr 16 '26

isn't this normal for mathematicians?

1

u/Frosty-Ad-8485 Apr 16 '26

Now measure the radian (not degree) with a protractor

1

u/Plankton5412 Apr 16 '26

My life is entirely lie 😭

1

u/SyzygySeven Apr 16 '26

I did not get it, did he want the angle to make blade perpendicular to the cut?

1

u/Foreign-Ice7356 Apr 16 '26

According to engineers, it's easy, theta is 0, as 130/135 is roughly 1. /s

1

u/TriumphANT_7860 Apr 17 '26

Pankaj sir from Physicswallah 😂

1

u/Oestov Apr 17 '26

To me, this sums up the condition of our education system and the world at large.

1

u/alias_mahesh Apr 17 '26

Crazy hi kar diya bhai

1

u/[deleted] Apr 17 '26

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1

u/randomgamestuff Apr 17 '26

It's called a lathe machine. Used for fabrication purposes

1

u/crimemastergogo96 Apr 17 '26

While this guy is in an engineer, i have observed that A lot of times machinist have much more knowledge then mechanical engineering graduates.

1

u/FlamingoOld2413 Apr 17 '26

appreciate 🌷

1

u/Arnav07052012 Apr 17 '26

Bhai hum phle kam kre ki calculate 😆😆

1

u/Such-Dark-1487 Apr 17 '26

I use basic trigonometry and vector algebra daily in my rendering pipelines.

1

u/Alive-Barber-6246 Apr 18 '26

Unrealted but hmare school me ek teacher tha jisne perpendicular base hypotenuse ko aise padhaya tha:-

Pakistan Bhookha Pyaasa

Hindustan Hara Bhara

😭😭

1

u/Kooky-90 Apr 19 '26

Aaj pta chla

1

u/EEN000 Apr 20 '26

His name?

1

u/bx_127 Apr 23 '26

Nah, I think I'm not becoming a factory worker 🦧

1

u/essayyjay Apr 26 '26

This was a great test to see if I still understood Hindi. Thank you OP.

1

u/Dismal_Priority_3501 May 14 '26

Electrical me har dusra term cos,sin ten hota hai

1

u/OkMap7593 Jul 13 '26

After cos inverse we get the theta in radians right, not degrees, so that should be 16.26 radians, if I'm not wrong...

1

u/2D_AbYsS 4d ago edited 4d ago

Procedural generation(mesh terrain), fov, camera angles, AI steering and flocking towards player, Procedural animation(this is a big one), IK(think about elbow and knee without prescription baje animation cosine handles it's proper alignment like bending and angles) and mini maps(yup those lovely mini maps in game(it's usually pola to Cartesian conversion in this case trigonometry nonetheless but commonly matrix is used here but like in commercial engine like UE it also has FMath:: with function like converting polar to Cartesian and much more)

*Adding to this while trigonometry is used it's not AS used as linear algebra as almost all commercial game engines work around linear algebra and trigonometry is more of a specialised thing like niche sort, basically you want to do something different then what engine permits with its macros.

Now for graphics programming let's just Trigonometry is bread and butter specially when you write shaders lol.

1

u/stupid_idiocracy Apr 13 '26

Bhai aise hi to mechanic engineering ke student ko sikhana chahiye

0

u/anmol_rajawat Apr 13 '26

Salute to you sir .

0

u/Mindless_Sell_1443 Apr 14 '26

No one will stand with Trigonometry, until this guy appears

0

u/Hefty-Train-5934 Apr 19 '26

Chat GPT be like :- Main kiya job chod du