Question

Square root of the square of the cosine: absolute value or not

score 1.7k · Answer 1 · 2026-04-15 00:47:29

1.7k

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Square root of the square of the cosine: absolute value or not

Published on 15 Apr 2026 - 0:47

score 67 · Answer 2 · 2026-04-16 00:21:27

67

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Point of contact of a isocele right triangle rotating on its right angle

Published on 16 Apr 2026 - 0:21

score 1.6k · Answer 3 · 2026-04-13 04:16:30

1.6k

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Finding fundamental period of $f(x)=\sec($sin(x)$)$

Published on 13 Apr 2026 - 4:16

score 147 · Answer 4 · 2026-05-05 12:44:27

147

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Proving $\cos2A+\cos2B-\cos2C=1-4\sin A\sin B\cos C$ with identities for $\sin2A+\sin2B+\sin2C$ and $\cos2A+\cos2B+\cos2C$

Published on 05 May 2026 - 12:44

score 487 · Answer 5 · 2026-04-16 09:57:26

If $\sin32^{\circ}=k$ and $\cos x=1-2k^2, \alpha$ and $\beta$ are the two values of $x$ between $0^{\circ}$ and $360^{\circ}$ with $\alpha<\beta$

score 41 · Answer 6 · 2026-04-13 15:21:28

41

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Which one of these ways to solve a simple Trig equation is more correct?

Published on 13 Apr 2026 - 15:21

score 92 · Answer 7 · 2026-04-16 02:43:01

92

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Find the volume of the pyramid given dihedral angles and the side lengths of the base triangle

Published on 16 Apr 2026 - 2:43

score 199 · Answer 8 · 2026-04-16 22:56:10

Showing $\sqrt[3]{\cos\frac{2\pi}{9}}+\sqrt[3]{\cos\frac{4\pi}{9}}+\sqrt[3]{\cos\frac{8\pi}{9}} = \sqrt[3]{\frac{3\sqrt[3]9-6}{2}} $

score 132 · Answer 9 · 2026-04-11 07:22:38

132

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Absolute value in polar curves

Published on 11 Apr 2026 - 7:22

score 183 · Answer 10 · 2026-04-15 13:07:42

183

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Looking for the general term of the power series for $\frac{1}{\cos{x}-\cos{b}}$

Published on 15 Apr 2026 - 13:07

score 73 · Answer 11 · 2026-04-17 07:33:37

73

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Name of functions that are similar to atan2

Published on 17 Apr 2026 - 7:33

score 243 · Answer 12 · 2026-04-17 15:19:17

243

Views

Solving $\cos{x} \cos{12x} \cos{15x} = \cos{5x} \cos{7x} \cos{16x}$

Published on 17 Apr 2026 - 15:19

score 341 · Answer 13 · 2026-04-16 00:40:22

341

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Intersection of yaw pitch vector with plane

Published on 16 Apr 2026 - 0:40

score 966 · Answer 14 · 2026-04-16 21:34:47

966

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If $(2^n+1)\theta=\pi$, $2^n\cos\theta \cos2\theta\cos2^2\theta \cdots\cos2^{n-1}\theta=$

Published on 16 Apr 2026 - 21:34

score 158 · Answer 15 · 2026-04-12 13:08:54

158

Views

Problem involving the square root of a trigonometric term

Published on 12 Apr 2026 - 13:08

List Question

Square root of the square of the cosine: absolute value or not

Point of contact of a isocele right triangle rotating on its right angle

Finding fundamental period of $f(x)=\sec($sin(x)$)$

Proving $\cos2A+\cos2B-\cos2C=1-4\sin A\sin B\cos C$ with identities for $\sin2A+\sin2B+\sin2C$ and $\cos2A+\cos2B+\cos2C$

If $\sin32^{\circ}=k$ and $\cos x=1-2k^2, \alpha$ and $\beta$ are the two values of $x$ between $0^{\circ}$ and $360^{\circ}$ with $\alpha<\beta$

Which one of these ways to solve a simple Trig equation is more correct?

Find the volume of the pyramid given dihedral angles and the side lengths of the base triangle

Showing $\sqrt[3]{\cos\frac{2\pi}{9}}+\sqrt[3]{\cos\frac{4\pi}{9}}+\sqrt[3]{\cos\frac{8\pi}{9}} = \sqrt[3]{\frac{3\sqrt[3]9-6}{2}} $

Absolute value in polar curves

Looking for the general term of the power series for $\frac{1}{\cos{x}-\cos{b}}$

Name of functions that are similar to atan2

Solving $\cos{x} \cos{12x} \cos{15x} = \cos{5x} \cos{7x} \cos{16x}$

Intersection of yaw pitch vector with plane

If $(2^n+1)\theta=\pi$, $2^n\cos\theta \cos2\theta\cos2^2\theta \cdots\cos2^{n-1}\theta=$

Problem involving the square root of a trigonometric term

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