Question

Why do we have $ \sin(x) = x \prod_{n=1}^{\infty} ( 1 - \frac{4}{3} \sin^2 (\frac{x}{3^n})) $

score 96 · Answer 1 · 2026-03-26 11:00:57

96

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Why do we have $ \sin(x) = x \prod_{n=1}^{\infty} ( 1 - \frac{4}{3} \sin^2 (\frac{x}{3^n})) $

Published on 26 Mar 2026 - 11:00

score 70 · Answer 2 · 2026-03-26 20:43:27

70

Views

Torque and Equilibrium (Complex Question)

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score 1k · Answer 3 · 2026-03-25 12:55:46

1k

Views

How can one understand the ATAN2() function for calculating the angle between 2 vectors?

Published on 25 Mar 2026 - 12:55

score 71 · Answer 4 · 2018-04-03 12:33:06

71

Views

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score 297 · Answer 5 · 2018-04-03 17:15:43

297

Views

Trigonometric series sum involving tangents

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score 106 · Answer 6 · 2018-04-03 22:12:06

106

Views

Process to solve for $x$

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score 492 · Answer 7 · 2018-04-03 23:15:17

492

Views

$arccsc(\csc(2\pi/3))$. What's the value?

Published on 03 Apr 2018 - 23:15

score 107 · Answer 8 · 2026-03-25 23:26:26

107

Views

Formula for summing an arbitrary number $n$ of cos functions?

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score 26 · Answer 9 · 2018-04-04 08:30:21

26

Views

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score 606 · Answer 10 · 2026-03-28 03:55:34

606

Views

How to prove $a^3 + b^3 +c^3 - 3abc =1 $, If a,b,c are infinite series as given in the description box below?

Published on 28 Mar 2026 - 3:55

score 109 · Answer 11 · 2026-03-25 01:27:23

109

Views

Closed form of $\sum_{n=1}^N\cos^2(n x)$

Published on 25 Mar 2026 - 1:27

score 541 · Answer 12 · 2026-03-25 19:24:55

541

Views

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Published on 25 Mar 2026 - 19:24

score 94 · Answer 13 · 2018-04-04 19:30:48

94

Views

Can $\sec x $ be not only $1/\cos x $ but also $\cos(1/x)$?

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score 140 · Answer 14 · 2026-03-25 03:18:07

140

Views

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Published on 25 Mar 2026 - 3:18

score 1.1k · Answer 15 · 2018-04-04 23:00:08

1.1k

Views

Find out if a point is inside triangle, only data available are distances

Published on 04 Apr 2018 - 23:00

List Question

Why do we have $ \sin(x) = x \prod_{n=1}^{\infty} ( 1 - \frac{4}{3} \sin^2 (\frac{x}{3^n})) $

Torque and Equilibrium (Complex Question)

How can one understand the ATAN2() function for calculating the angle between 2 vectors?

Domain of definition of function $\frac{1}{\tan x}$

Trigonometric series sum involving tangents

Process to solve for $x$

$arccsc(\csc(2\pi/3))$. What's the value?

Formula for summing an arbitrary number $n$ of cos functions?

Simple query related to $\cos(\theta)$ function

How to prove $a^3 + b^3 +c^3 - 3abc =1 $, If a,b,c are infinite series as given in the description box below?

Closed form of $\sum_{n=1}^N\cos^2(n x)$

Why is tan not adj/opp?

Can $\sec x $ be not only $1/\cos x $ but also $\cos(1/x)$?

Rotating boxes of variable width around a circle.

Find out if a point is inside triangle, only data available are distances

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