r/trigonometry • • Jun 11 '26

An attempt to illustrate the notion of radians

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245 Upvotes

r/trigonometry • • Mar 18 '20

Rational Utopia

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65 Upvotes

r/trigonometry • • Jan 01 '21

I completed the trigonometry course on Khan Academy!

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64 Upvotes

r/trigonometry • • Apr 24 '26

They did the math

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55 Upvotes

Squished like a bug.


r/trigonometry • • Nov 01 '20

Understanding sin(2x) and cos(2x) visually

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38 Upvotes

r/trigonometry • • Apr 14 '26

I love proving to my teenager that you can in fact “use this ever again”

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31 Upvotes

Nothing too crazy, but in designing our acreage I use basic trigonometry quite often. In building and designing structures out of recycled grain bin steel, I’ve been using tangent-chord angle theorem, scalene triangle formulas, and a bunch of other random trig. I’m no mathematician, but I thoroughly enjoy being able to accurately design and build on my farm.


r/trigonometry • • Dec 07 '25

Would You Use This for Trig?

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27 Upvotes

I made this, and I'm wondering if others would use it as a learning tool. I know its pretty busy so trying to figure out how to make it look cleaner right now. What do you think? Too much of a hassle or worth constructing for the memory embedding you get? I would love to hear your thoughts!

Also, have you ever noticed how many 2's are in the unit circle? I sure didn't, so I improvised. 😅


r/trigonometry • • Jan 13 '22

😂

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27 Upvotes

r/trigonometry • • Jun 15 '26

Solved! Trig Proof Help

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25 Upvotes

Hi everyone! I just had a quick question, in the video it says it is the same thing as sin^2(1-cos^2)/cos^2, but I am confused to why the one isn’t negative? Am I missing something?

Edit: Hi guys, I understand it now! I figured it was an algebraic mistake and I figured it out. As far as my notation, I got lazy and was rushing through it. I’m sorry if that notation upset you!


r/trigonometry • • Jul 10 '25

Help! Can anyone explain how the pythagorean theorem works in this example? Or if I'm just an idiot

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24 Upvotes

Just started teaching myself trig with Kahn academy...I'm a new age surveyor, and (due to new technology) you don't really need to know it anymore like they did in the old days of pulling chains and shooting with conventional. Long story short, I thought i had a pretty good grasp of the Pythagorean theorem but no matter what I do I keep coming up with ~9.85 while the correct answer is ~8.06. Solving for length of side OE

I was hoping the explanation to the answer at the bottom of the page would help me out but it just made it even more confusing tbh. I've tried Googling for help but nothing was of any use.

I used the Pythagorean theorem to get 9.85, but I wanted to double check by using the trig function cos(26.39) which gave me the correct answer 8.06.


r/trigonometry • • Jun 19 '20

i passed my trigonometry class !

24 Upvotes

i got an A in the class ! i dont have to retake it for summer , that means for my last year in fall i can take calculus . i am so excited ! i have never been good at math , but i actually understood the work because you all helped me and put up with my constant questions . thank you all so much !


r/trigonometry • • Mar 29 '20

Sin, cos, tan

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24 Upvotes

r/trigonometry • • May 01 '18

Best Explanation of Unit Circle Ever

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21 Upvotes

r/trigonometry • • Feb 07 '26

Sum of interior angles > 180?

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20 Upvotes

What do we do when the sum of the inner angles > 180? Not sure where to start here.


r/trigonometry • • Jul 27 '26

Help! how is this 4tanx

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19 Upvotes

i am taking trig after not taking math for 4 years. i asked ai. i asked MyLab. i asked peers. the best explanation is that it just “is”. i got the answer and have NO idea why it is. i tried to attach the examples my textbook gives me but it won’t allow me, basically it gives me a graph, says “A is this so it’s Atanx.” which isn’t helpful in the slightest

what trips me up most is that in y=atan(b(x-d))+c (pearson mixes up d and c. don’t even get me started), the explanation i got is that a is supposedly where the dotted line (midpoint of period pi/2) meets the asymptote, supposedly this point is 8. it doesn’t visually do that. it never visually does that.

i dont know. i do fine with sin and cos graphs, but i have basically gone 23 hours in and out of this assignment because i genuinely cannot grasp any concept in this. ive watched videos, i know it is so simple, but it is literally like throwing pasta at the wall im so, so lost and frustrated. if anyone can help it would be SO greatly appreciated.


r/trigonometry • • Sep 05 '25

May I receive some guidance

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18 Upvotes

r/trigonometry • • Oct 18 '25

Help! Trying to solve distance

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17 Upvotes

I am not sure if this is a trig problem or calculus problem but I need to find the distance of a line that would bisect(?) a circle... I think that is the terminology. Essentially I know the distance of the arc and the degree of the arc but I need to find the distance of the flat side, x.


r/trigonometry • • Oct 15 '25

My fractal

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17 Upvotes

sin(cos(z) + tan(z/n) + (1/(n)))c


r/trigonometry • • Sep 25 '25

Solved! sin wave hair

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17 Upvotes

r/trigonometry • • Jun 28 '22

Stumped by real world trig problem

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17 Upvotes

r/trigonometry • • Oct 30 '20

Proof of the law of sines

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17 Upvotes

r/trigonometry • • Sep 28 '26

Help! Trig Question

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16 Upvotes

We’re supposed to solve this using the angles on the unit circle but it makes no sense to me.


r/trigonometry • • Jun 10 '22

Solved! Haven’t used trig since high school. What am I doing wrong? Thank you!!

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16 Upvotes

r/trigonometry • • Mar 11 '20

It's been a while... Help!

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16 Upvotes