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Proving trigonometric equation $\cos(36^\circ) - \cos(72^\circ) = 1/2$

score 6.4k · Answer 1 · 2026-04-15 21:21:44

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Proving trigonometric equation $\cos(36^\circ) - \cos(72^\circ) = 1/2$

Published on 15 Apr 2026 - 21:21

score 66 · Answer 2 · 2026-04-14 10:53:21

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trigonometric angle tangent identity, a and b are equivalent?

Published on 14 Apr 2026 - 10:53

score 212 · Answer 3 · 2026-04-15 14:19:35

212

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Trigonometry $\tan \theta = \dfrac43$

Published on 15 Apr 2026 - 14:19

score 137 · Answer 4 · 2026-04-14 07:01:07

137

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How can I master trigonometry and be able to do quesitons like these

Published on 14 Apr 2026 - 7:01

score 620 · Answer 5 · 2026-04-15 09:03:07

620

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Equations involving trigonometric ratios

Published on 15 Apr 2026 - 9:03

score 118 · Answer 6 · 2026-04-16 07:49:23

118

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$\frac{1}{\sin^2(x)}+\frac{1}{\cos^2(x)} = \cos^2(x)+\sin^2(x) ?$

Published on 16 Apr 2026 - 7:49

score 366 · Answer 7 · 2026-04-14 03:10:56

366

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What is the value of $\alpha$ in, $\tan\theta=\frac{Q\sin\alpha}{P+Q\cos\alpha}.$

Published on 14 Apr 2026 - 3:10

score 134 · Answer 8 · 2026-04-13 20:12:34

134

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Proving a trigonometric identity by infinite series

Published on 13 Apr 2026 - 20:12

score 3.3k · Answer 9 · 2026-04-15 14:48:09

3.3k

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Why is $\sin(\pi/6) = 0.5$?

Published on 15 Apr 2026 - 14:48

score 4k · Answer 10 · 2026-04-11 20:09:13

4k

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Parametric Equation of sine wave helically wrapped around a cylinder

Published on 11 Apr 2026 - 20:09

score 128 · Answer 11 · 2026-04-16 02:37:01

128

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Basic algebra, isolating the variable

Published on 16 Apr 2026 - 2:37

score 637 · Answer 12 · 2026-04-16 09:21:43

Let $f(x)$ denote the sum of the infinite trigonometric series, $f(x) =\sum^{\infty}_{n=1} \sin\frac{2x}{3^n}\sin\frac{x}{3^n}$

score 5.9k · Answer 13 · 2026-04-15 09:09:53

5.9k

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Calculate dimensions of square inside a rotated square

Published on 15 Apr 2026 - 9:09

score 116 · Answer 14 · 2026-04-10 04:03:38

116

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To find a fifth degree equation by using circles and lines that cannot be solved by radicals

Published on 10 Apr 2026 - 4:03

score 3.6k · Answer 15 · 2026-04-12 22:24:54

3.6k

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Extreme Points of $f(x,y) = \sin(x)+\sin(y)+\sin(x+y)$.

Published on 12 Apr 2026 - 22:24

List Question

Proving trigonometric equation $\cos(36^\circ) - \cos(72^\circ) = 1/2$

trigonometric angle tangent identity, a and b are equivalent?

Trigonometry $\tan \theta = \dfrac43$

How can I master trigonometry and be able to do quesitons like these

Equations involving trigonometric ratios

$\frac{1}{\sin^2(x)}+\frac{1}{\cos^2(x)} = \cos^2(x)+\sin^2(x) ?$

What is the value of $\alpha$ in, $\tan\theta=\frac{Q\sin\alpha}{P+Q\cos\alpha}.$

Proving a trigonometric identity by infinite series

Why is $\sin(\pi/6) = 0.5$?

Parametric Equation of sine wave helically wrapped around a cylinder

Basic algebra, isolating the variable

Let $f(x)$ denote the sum of the infinite trigonometric series, $f(x) =\sum^{\infty}_{n=1} \sin\frac{2x}{3^n}\sin\frac{x}{3^n}$

Calculate dimensions of square inside a rotated square

To find a fifth degree equation by using circles and lines that cannot be solved by radicals

Extreme Points of $f(x,y) = \sin(x)+\sin(y)+\sin(x+y)$.

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