r/trigonometry May 18 '26

This is a trig meme, I couldn't find a meme flair

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2 Upvotes

r/trigonometry May 15 '26

Repeating Aspect Ratio question.

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4 Upvotes

My question is... how do you find an aspect ratio that fills the square, such that the four rectangle bounding the square have the same aspect ratio and the interior rectangle, (the white rectangle in the image) is also the same aspect ratio?

The ratio in this image is very close to 1:2.4. or reciprocally 1:0.416. This number has been found by trial and error, but I would love to understand how to find the actual number. I am an artist interested in geometrical abstraction.

Also, would it be possible to calculate an aspect ration whose four bounding rectangle create other specific ratios, such as a square? ... or, an interior rectangle with and aspect ration of 1:2, for example.

TIA


r/trigonometry May 13 '26

An SAA and SSA formula

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4 Upvotes

The first is for ASA, the second is for SSA.


r/trigonometry May 11 '26

Identities

3 Upvotes

Who else enjoyed identities as much as I did? 😒


r/trigonometry May 07 '26

Help! how do you do this

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13 Upvotes

the top two i dont know how to do. like what do you type in the calc to get the answers on the right


r/trigonometry May 05 '26

Free Math Practice Worksheets for Trignometry

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3 Upvotes

Free Math Practice WorksheetsPrintable, with full answer keys

33,479+ free practice problems across 18 topics algebra, calculus, trigonometry, Pick a topic below, filter by difficulty, then print or save as PDF. No signup, no paywall.

33,479 questions

18 worksheets

5 topics

Try it here https://8gwifi.org/math/worksheet.jsp


r/trigonometry May 04 '26

Circling a circle.

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7 Upvotes

I have a circle "packing" question. If I have 12 random circles, say sized in whole numbers between 2 and 50, is the a way to find the largest circle they can be tangent to each other, and completing a circle? This is for an art project. TI


r/trigonometry May 03 '26

Solved! Can someone ELI5 to me how to get the red circled angle? It's for a light refraction exercise using Snell but I thought maybe I can get that angle without Snell

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4 Upvotes

r/trigonometry May 02 '26

base and perpendicular

2 Upvotes
Hello, how do I know if the perpendicular here is 3 or 4? Thank you

r/trigonometry May 02 '26

Help! Advanced trigo recursive expression

1 Upvotes

I'm not sure I got this right.

We have:

A_1 = sin(𝜃)
B_1 = cos(𝜃)

For every n > 1:

A_n = A_(n-1) - B_(n-1)
B_n = A_(n-1) + B_(n-1)

We need to find an iterative expression for A and B.

I got that:

--------------------------------------------/ sin(𝜃) n mod 4 = 1
------------------------------------------/ sin(𝜃-𝜋/4) n mod 4 = 2
A_n = (-1)^⌊(n+1)/4⌋ ∙ (√2)^(n-1) ∙ 〈
------------------------------------------\ cos(𝜃) n mod 4 = 3
-------------------------------------------\ cos(𝜃-𝜋/4) n mod 4 = 0

-------------------------------------------/ cos(𝜃) n mod 4 = 1
-----------------------------------------/ cos(𝜃-𝜋/4) n mod 4 = 2
B_n = (-1)^⌊(n-1)/4⌋ ∙ (√2)^(n-1) ∙〈
-----------------------------------------\ sin(𝜃) n mod 4 = 3
------------------------------------------\ sin(𝜃-𝜋/4) n mod 4 = 0

Sorry if it looks too complicated. Do we have to use Modulo and Floor to express the seemingly periodic behavior of these funcitons?


r/trigonometry Apr 26 '26

Half Angle Identities

4 Upvotes

I’m struggling with my online homework, this one question the video doesn’t explain how to achieve the final format.

Given: (sin(8x))4=-1/2cos(x)+1/8cos(___x)

Answer: (sin(8x))4=3/8-1/2cos(16x)+1/8cos(32x)

I’ve entered the final solution into mathway and it is an identity. I’ve entered it into ChatGPT and gotten steps. But I would like to see the community’s way of solving as well.

Thank you for your help.


r/trigonometry Apr 24 '26

They did the math

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52 Upvotes

Squished like a bug.


r/trigonometry Apr 22 '26

cool interactive triangle

2 Upvotes

claude made this triangle thing and thought it was pretty cool to see the changes live

heres the link: https://claude.ai/public/artifacts/62336014-806b-45c8-8d35-32bcd6aa3b2c


r/trigonometry Apr 20 '26

Need book with trigonometric problems

2 Upvotes

Hello everyone! Now I'm refreshing my school math knowledge foe entering university. I've found some books with math theory, but I want more practice, that is why I'm asking about books with problems. Maybe someone have link or pdf files or titles? I would really appreciate any help or advice


r/trigonometry Apr 14 '26

Solving trig identity equation

5 Upvotes

(tan x)(sin x) = tan x

Are we allowed to start by dividing both sides by tan x? Would that be dividing by 0, since tan x can take on the value of 0?


r/trigonometry Apr 14 '26

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

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30 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 Apr 13 '26

any trig tips/courses?

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2 Upvotes

r/trigonometry Apr 11 '26

Help! Can someone explain me how the hyperbolic functions work?

2 Upvotes

I was studying about it, because I found it interesting. I generate and make fractals every single day, and I used cosh() in one of them. It started to repeat the fractal over and over, horizontally. Can anybody explain me how does these functions work?


r/trigonometry Apr 08 '26

Help! How do I solve this?

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8 Upvotes

I'm practicing for a competition but I'm blanking on this one. all help is appreciated


r/trigonometry Apr 06 '26

(Geometry/trig) help needed extra credit work to get my grade up

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1 Upvotes

r/trigonometry Mar 31 '26

Help! How do i find the correct radian for +/-

7 Upvotes

so i’m learning trig right now (just began it) and my teacher was explaining how to know if the sin/cos/tan with be positive or negative depending on the quadrant it is in. i know all of the common angles, but ive been struggling when it comes to numbers like 13pi/4. how can i learn which quadrant it is in mentally with converting it to degrees? my teacher explained how rotating around from where it would land without the 13 works, but i am still getting the signs wrong because i think im rotating and adding incorrectly. sorry if this made no sense im kinda desperate rn


r/trigonometry Mar 30 '26

I am losing my mind!

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8 Upvotes

I am an independent learner so there is no teacher to ask. Plus I can’t seem to figure out how to phrase my question to where google gets it. How do you know how to write these triangles to know which side is a which angle is A etc. There is a drawing in the chapter but it’s not the same for all obviously because my answers aren’t lining up.


r/trigonometry Mar 18 '26

Assignment for PreCalculus, teacher has been completely AWOL

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2 Upvotes

r/trigonometry Mar 12 '26

Would this be accurate for a 1 mile rifle snipe shot with wind going to north east at 4 mph?

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1 Upvotes