Question

Proving that the power series for the cosine function is greater than zero, for $x$ in $[0, \pi/2)$.

score 703 · Answer 1 · 2026-04-14 04:49:44

703

Views

Proving that the power series for the cosine function is greater than zero, for $x$ in $[0, \pi/2)$.

Published on 14 Apr 2026 - 4:49

score 31 · Answer 2 · 2026-04-12 21:34:48

31

Views

formula for getting the normlized X and Y values of a given degrees from a linear function

Published on 12 Apr 2026 - 21:34

score 167 · Answer 3 · 2026-04-12 00:44:36

167

Views

Prove the definition of the arcsin(s).

Published on 12 Apr 2026 - 0:44

score 38 · Answer 4 · 2026-04-09 20:41:33

38

Views

Maths Trignometric function

Published on 09 Apr 2026 - 20:41

score 58 · Answer 5 · 2026-04-14 12:56:26

58

Views

If $\cos(x+a)=\cos(x+y+z)$, then can we deduce that $a=y+z$?

Published on 14 Apr 2026 - 12:56

score 4.1k · Answer 6 · 2026-04-11 23:02:18

4.1k

Views

The actual frequency of a wave that is the sum of sine waves with two different frequencies.

Published on 11 Apr 2026 - 23:02

score 811 · Answer 7 · 2026-04-09 03:21:14

811

Views

How can I deduce the hypotenuse from the information given?

Published on 09 Apr 2026 - 3:21

score 84 · Answer 8 · 2026-04-11 23:12:38

84

Views

Whether to use Law of Sines of Law of Cosines?

Published on 11 Apr 2026 - 23:12

score 71 · Answer 9 · 2026-04-11 06:35:04

71

Views

Is this simple equivalence on Euler's identity true?

Published on 11 Apr 2026 - 6:35

score 83 · Answer 10 · 2026-03-26 13:02:41

Simplified form of $\cos^{-1}\big[\frac{3}{5}\cdot\cos x+\frac{4}{5}\cdot\sin x\big]$, where $x\in\big[\frac{-3\pi}{4},\frac{3\pi}{4}\big]$

score 51 · Answer 11 · 2026-04-13 22:20:22

51

Views

Trigonometric equation over unit circle

Published on 13 Apr 2026 - 22:20

score 31 · Answer 12 · 2026-04-02 21:40:47

31

Views

$p_0^2 + q_0^2 = 1$ and $-\sin(s) = -p_0\sin(s) + q_0\cos(s)$ $\rightarrow $ $p_0 = -\cos2s, q_0 = -\sin(2s)$

Published on 02 Apr 2026 - 21:40

score 89 · Answer 13 · 2018-12-10 23:03:38

89

Views

Proving $\sin\frac\pi7 \cdot \sin\frac{2 \pi}{7}\cdot\sin\frac{3 \pi}{7} = \frac{\sqrt7}{8}$

Published on 10 Dec 2018 - 23:03

score 74 · Answer 14 · 2026-04-09 13:51:07

74

Views

How do I prove the identities of these questions?

Published on 09 Apr 2026 - 13:51

score 25 · Answer 15 · 2026-04-13 04:23:36

25

Views

Questioning the commutative property in complex powers

Published on 13 Apr 2026 - 4:23

List Question

Proving that the power series for the cosine function is greater than zero, for $x$ in $[0, \pi/2)$.

formula for getting the normlized X and Y values of a given degrees from a linear function

Prove the definition of the arcsin(s).

Maths Trignometric function

If $\cos(x+a)=\cos(x+y+z)$, then can we deduce that $a=y+z$?

The actual frequency of a wave that is the sum of sine waves with two different frequencies.

How can I deduce the hypotenuse from the information given?

Whether to use Law of Sines of Law of Cosines?

Is this simple equivalence on Euler's identity true?

Simplified form of $\cos^{-1}\big[\frac{3}{5}\cdot\cos x+\frac{4}{5}\cdot\sin x\big]$, where $x\in\big[\frac{-3\pi}{4},\frac{3\pi}{4}\big]$

Trigonometric equation over unit circle

$p_0^2 + q_0^2 = 1$ and $-\sin(s) = -p_0\sin(s) + q_0\cos(s)$ $\rightarrow $ $p_0 = -\cos2s, q_0 = -\sin(2s)$

Proving $\sin\frac\pi7 \cdot \sin\frac{2 \pi}{7}\cdot\sin\frac{3 \pi}{7} = \frac{\sqrt7}{8}$

How do I prove the identities of these questions?

Questioning the commutative property in complex powers

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