Question

How to show that $\cos(x)=\sum\limits_{n=0}^\infty (-1)^n \frac {x^{2n}}{ (2n)!} $

score 74 · Answer 1 · 2026-04-13 21:10:25

74

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How to show that $\cos(x)=\sum\limits_{n=0}^\infty (-1)^n \frac {x^{2n}}{ (2n)!} $

Published on 13 Apr 2026 - 21:10

score 108 · Answer 2 · 2026-04-16 21:46:53

108

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$ a \cos A + b \cos B + c \cos C = \dfrac{a+b+c}2 $ $\implies$ the triangle is equilateral?

Published on 16 Apr 2026 - 21:46

score 1.5k · Answer 3 · 2026-04-10 22:05:55

1.5k

Views

Solving polynomial equation using known trigonometric identity

Published on 10 Apr 2026 - 22:05

score 695 · Answer 4 · 2026-04-16 12:24:30

695

Views

Compute $\int_0^1 \frac{\arcsin(x)}{x}dx$

Published on 16 Apr 2026 - 12:24

score 288 · Answer 5 · 2026-04-09 20:03:46

288

Views

Is this integral with sine and cosine such a challenge?

Published on 09 Apr 2026 - 20:03

score 3.4k · Answer 6 · 2026-04-14 10:11:28

3.4k

Views

What is the relationship between the area of a triangle and an area of a segment of a circle?

Published on 14 Apr 2026 - 10:11

score 115 · Answer 7 · 2026-04-13 15:56:11

115

Views

Trigonometry Inequality Involving Powers of Sin, Cos.

Published on 13 Apr 2026 - 15:56

score 137 · Answer 8 · 2026-04-16 21:25:47

137

Views

using Excel to calculate sine of an angle

Published on 16 Apr 2026 - 21:25

score 16k · Answer 9 · 2026-04-18 18:05:56

16k

Views

Expansion of $\sin^5 \theta$ using the Complex Exponential

Published on 18 Apr 2026 - 18:05

score 105 · Answer 10 · 2026-04-13 17:19:53

105

Views

Trigonometric solutions

Published on 13 Apr 2026 - 17:19

score 196 · Answer 11 · 2026-04-11 05:40:55

196

Views

maximum of trigonometric function

Published on 11 Apr 2026 - 5:40

score 4.9k · Answer 12 · 2026-04-12 12:37:05

4.9k

Views

What is the theorem called that states that equal angles gives equal sides?

Published on 12 Apr 2026 - 12:37

score 56 · Answer 13 · 2026-04-12 02:53:36

56

Views

Inverting complicated function (possibly using secant root finder)

Published on 12 Apr 2026 - 2:53

score 120 · Answer 14 · 2026-04-19 11:29:21

120

Views

Prove the normal will be at constant distance form origin in this parametric function?

Published on 19 Apr 2026 - 11:29

score 327 · Answer 15 · 2026-04-09 04:54:22

327

Views

Heading vector from angle (generated by trig) does not have expected result

Published on 09 Apr 2026 - 4:54

List Question

How to show that $\cos(x)=\sum\limits_{n=0}^\infty (-1)^n \frac {x^{2n}}{ (2n)!} $

$ a \cos A + b \cos B + c \cos C = \dfrac{a+b+c}2 $ $\implies$ the triangle is equilateral?

Solving polynomial equation using known trigonometric identity

Compute $\int_0^1 \frac{\arcsin(x)}{x}dx$

Is this integral with sine and cosine such a challenge?

What is the relationship between the area of a triangle and an area of a segment of a circle?

Trigonometry Inequality Involving Powers of Sin, Cos.

using Excel to calculate sine of an angle

Expansion of $\sin^5 \theta$ using the Complex Exponential

Trigonometric solutions

maximum of trigonometric function

What is the theorem called that states that equal angles gives equal sides?

Inverting complicated function (possibly using secant root finder)

Prove the normal will be at constant distance form origin in this parametric function?

Heading vector from angle (generated by trig) does not have expected result

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