Question

Is my solution correct? (trigonometry)

score 57 · Answer 1 · 2026-04-10 21:42:31

57

Views

Is my solution correct? (trigonometry)

Published on 10 Apr 2026 - 21:42

score 231 · Answer 2 · 2026-04-15 21:29:01

231

Views

Why is $\frac{\sin (-x)}{\cos (-x)}$ not equal to $\frac{-\sin (x)}{-\cos (x)}$

Published on 15 Apr 2026 - 21:29

score 426 · Answer 3 · 2026-04-15 02:37:20

426

Views

Prove $\sin(x)+ \sin(x+a) + \sin(x+2a) + \sin(x+3a) + \sin(x+4a) = 0$ , given $a = 72^\circ$

Published on 15 Apr 2026 - 2:37

score 37 · Answer 4 · 2026-04-16 22:02:55

37

Views

Drawing $(x_n,y_n) = \left((1+\frac{1}{5}(-1)^n)\cos n\theta,(1+\frac{1}{5}(-1)^n)\sin n\theta\right)$

Published on 16 Apr 2026 - 22:02

score 194 · Answer 5 · 2026-04-17 00:55:24

194

Views

What is $\cos\left(\frac{\arctan(x)}{3}\right)$ and $\sin\left(\frac{\arctan(x)}{3}\right)$?

Published on 17 Apr 2026 - 0:55

score 157 · Answer 6 · 2026-04-16 11:54:01

157

Views

If $x\in [-1,0)$, then what is the value of $\cos^{-1} (2x^2-1) - 2 \sin^{-1} x$?

Published on 16 Apr 2026 - 11:54

score 77 · Answer 7 · 2026-04-12 00:21:24

77

Views

Not fully understanding the cosine angle addition identity in a definite integral problem

Published on 12 Apr 2026 - 0:21

score 127 · Answer 8 · 2026-04-15 12:58:25

127

Views

What is wrong with my solution of maximum value of $ \sin \frac {A}{2} + \sin \frac{B}{2} + \sin \frac{C}{2} $ in a triangle ABC?

Published on 15 Apr 2026 - 12:58

score 75 · Answer 9 · 2026-04-15 19:36:48

75

Views

$ \sin(\arccos(\frac1{\sqrt3})) = \frac{\sqrt2}{\sqrt3} $ proof

Published on 15 Apr 2026 - 19:36

score 547 · Answer 10 · 2026-04-16 23:54:15

547

Views

If$ \cos(a-b) = 3\sin(a+b)$ then find $\frac{1}{1-3sin2a} +\frac{1}{1-3sin2b}$

Published on 16 Apr 2026 - 23:54

score 863 · Answer 11 · 2026-04-09 16:16:04

863

Views

Finding the infinite sum involving $\coth$ function using contour integration

Published on 09 Apr 2026 - 16:16

score 716 · Answer 12 · 2026-04-13 12:51:56

716

Views

Sum of reciprocal sine function $\sum\limits_{k=1}^{n-1} \frac{1}{\sin(\frac{k\pi}{n})}=?$

Published on 13 Apr 2026 - 12:51

score 108 · Answer 13 · 2026-04-09 01:22:08

108

Views

Three Dimensional Trigonometry

Published on 09 Apr 2026 - 1:22

score 147 · Answer 14 · 2026-04-13 16:23:29

147

Views

Maximum value of $\sin A+\sin B+\sin C$ without calculus or Lagrange Multipliers

Published on 13 Apr 2026 - 16:23

score 41 · Answer 15 · 2026-04-17 12:02:14

41

Views

Range of $\tan^{-1} (2x)$?

Published on 17 Apr 2026 - 12:02

List Question

Is my solution correct? (trigonometry)

Why is $\frac{\sin (-x)}{\cos (-x)}$ not equal to $\frac{-\sin (x)}{-\cos (x)}$

Prove $\sin(x)+ \sin(x+a) + \sin(x+2a) + \sin(x+3a) + \sin(x+4a) = 0$ , given $a = 72^\circ$

Drawing $(x_n,y_n) = \left((1+\frac{1}{5}(-1)^n)\cos n\theta,(1+\frac{1}{5}(-1)^n)\sin n\theta\right)$

What is $\cos\left(\frac{\arctan(x)}{3}\right)$ and $\sin\left(\frac{\arctan(x)}{3}\right)$?

If $x\in [-1,0)$, then what is the value of $\cos^{-1} (2x^2-1) - 2 \sin^{-1} x$?

Not fully understanding the cosine angle addition identity in a definite integral problem

What is wrong with my solution of maximum value of $ \sin \frac {A}{2} + \sin \frac{B}{2} + \sin \frac{C}{2} $ in a triangle ABC?

$ \sin(\arccos(\frac1{\sqrt3})) = \frac{\sqrt2}{\sqrt3} $ proof

If$ \cos(a-b) = 3\sin(a+b)$ then find $\frac{1}{1-3sin2a} +\frac{1}{1-3sin2b}$

Finding the infinite sum involving $\coth$ function using contour integration

Sum of reciprocal sine function $\sum\limits_{k=1}^{n-1} \frac{1}{\sin(\frac{k\pi}{n})}=?$

Three Dimensional Trigonometry

Maximum value of $\sin A+\sin B+\sin C$ without calculus or Lagrange Multipliers

Range of $\tan^{-1} (2x)$?

Trending Questions

Popular # Hahtags

Popular Questions