Question

Help with this trigonometric equation

score 637 · Answer 1 · 2026-04-02 04:41:10

637

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Help with this trigonometric equation

Published on 02 Apr 2026 - 4:41

score 123 · Answer 2 · 2018-04-09 01:58:35

123

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Why did I get extra solutions to $6\cos \theta + 7\sin \theta = 4 $?

Published on 09 Apr 2018 - 1:58

score 35 · Answer 3 · 2026-03-30 02:08:51

35

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Finding closed form expression for the roots of $f(x) = \sum_{i=1}^K \frac{\alpha_i \gamma_i \sin(x-\theta_i)}{1+\gamma_i[1+\cos(x-\theta_i) ]}$

Published on 30 Mar 2026 - 2:08

score 57 · Answer 4 · 2026-03-25 14:25:25

57

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Consider the equation $x^2+xy+3y^2=1$. After an proper counter clock-wise rotation of the coordinate system by an angle $0<\theta<\pi$...

Published on 25 Mar 2026 - 14:25

score 351 · Answer 5 · 2026-03-27 23:40:56

351

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Angle in a 80-80-20 triangle

Published on 27 Mar 2026 - 23:40

score 233 · Answer 6 · 2026-03-24 23:44:35

233

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[[complex]] Solutions of $x=\sqrt{\sin{x}}$

Published on 24 Mar 2026 - 23:44

score 1.4k · Answer 7 · 2026-03-25 06:06:27

1.4k

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Prove that $\sin(z) =\frac{e^{iz}-e^{-iz}}{2i} =\sin(x)\cosh(y) +i\cos(x)\sinh(y)$

Published on 25 Mar 2026 - 6:06

score 40 · Answer 8 · 2018-04-10 14:44:57

40

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Proving the identity $\tan (A)-\sin^2(A)\tan(A) = \cos(A)\sin(A)$

Published on 10 Apr 2018 - 14:44

score 351 · Answer 9 · 2026-03-26 00:16:54

351

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Is it possible to say that $\arg(0)= \infty $ since it's not undefined or it is $0$ since $0|0$?

Published on 26 Mar 2026 - 0:16

score 63 · Answer 10 · 2026-03-25 12:55:12

63

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Simplify $\sin(\alpha)+\sin(\alpha+x)+\sin(\alpha+2x)+\sin(\alpha+3x)+ \dotsb +\sin(\alpha+nx)$

Published on 25 Mar 2026 - 12:55

score 48 · Answer 11 · 2026-03-25 03:22:47

48

Views

How to make the angular parameterization of $x^2+y^2=1$ unique?

Published on 25 Mar 2026 - 3:22

score 1.4k · Answer 12 · 2018-04-10 20:53:20

1.4k

Views

Simplifying $\cos(x-360^\circ)$

Published on 10 Apr 2018 - 20:53

score 993 · Answer 13 · 2018-04-10 21:19:10

993

Views

How can I find the hypotenuse and opposite sides of triangle?

Published on 10 Apr 2018 - 21:19

score 478 · Answer 14 · 2018-04-11 04:30:23

478

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If sides $a$, $b$, $c$ of $\triangle ABC$ are in arithmetic progression, then $3\tan\frac{A}{2}\tan\frac {C}{2}=1$

Published on 11 Apr 2018 - 4:30

score 227 · Answer 15 · 2018-04-11 15:33:04

227

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Verify $ \frac {\cot x \cos x}{\cot x + \cos x} = \frac {\cot x - \cos x}{\cot x \cos x} $

Published on 11 Apr 2018 - 15:33

List Question

Help with this trigonometric equation

Why did I get extra solutions to $6\cos \theta + 7\sin \theta = 4 $?

Finding closed form expression for the roots of $f(x) = \sum_{i=1}^K \frac{\alpha_i \gamma_i \sin(x-\theta_i)}{1+\gamma_i[1+\cos(x-\theta_i) ]}$

Consider the equation $x^2+xy+3y^2=1$. After an proper counter clock-wise rotation of the coordinate system by an angle $0<\theta<\pi$...

Angle in a 80-80-20 triangle

[[complex]] Solutions of $x=\sqrt{\sin{x}}$

Prove that $\sin(z) =\frac{e^{iz}-e^{-iz}}{2i} =\sin(x)\cosh(y) +i\cos(x)\sinh(y)$

Proving the identity $\tan (A)-\sin^2(A)\tan(A) = \cos(A)\sin(A)$

Is it possible to say that $\arg(0)= \infty $ since it's not undefined or it is $0$ since $0|0$?

Simplify $\sin(\alpha)+\sin(\alpha+x)+\sin(\alpha+2x)+\sin(\alpha+3x)+ \dotsb +\sin(\alpha+nx)$

How to make the angular parameterization of $x^2+y^2=1$ unique?

Simplifying $\cos(x-360^\circ)$

How can I find the hypotenuse and opposite sides of triangle?

If sides $a$, $b$, $c$ of $\triangle ABC$ are in arithmetic progression, then $3\tan\frac{A}{2}\tan\frac {C}{2}=1$

Verify $ \frac {\cot x \cos x}{\cot x + \cos x} = \frac {\cot x - \cos x}{\cot x \cos x} $

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