Question

How to find the angle of a vector based on origin?

score 42 · Answer 1 · 2026-04-17 13:14:13

How to find the angle of a vector based on origin?

Published on 17 Apr 2026 - 13:14

score 3.4k · Answer 2 · 2026-04-15 16:39:40

Is there an easy way to quickly prove (or memorize) inverse trig formulas such as $ \arcsin(a) = \arctan(\frac{a}{\sqrt{1-a^2}}) $?

score 83 · Answer 3 · 2026-04-15 22:38:05

83

Views

Twice angle conditions with a point in a triangle

Published on 15 Apr 2026 - 22:38

score 89 · Answer 4 · 2026-04-14 10:19:19

89

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Why do the sines of the numerators of $\pi$’s continued fraction convergents approach zero?

Published on 14 Apr 2026 - 10:19

score 185 · Answer 5 · 2026-04-14 22:36:49

185

Views

Prime number and Relationship of Sequences of period 4,5,and 6

Published on 14 Apr 2026 - 22:36

score 29 · Answer 6 · 2026-04-13 23:17:36

29

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Trigonometric equations for three different regions on number line

Published on 13 Apr 2026 - 23:17

score 64 · Answer 7 · 2026-04-13 10:40:55

64

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Finding $\phi$ so that we have $3$ equal sets

Published on 13 Apr 2026 - 10:40

score 45 · Answer 8 · 2026-04-11 14:03:55

45

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Different approaches to calculating angle between two vectors

Published on 11 Apr 2026 - 14:03

score 216 · Answer 9 · 2026-04-15 19:05:49

216

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Prove $x^2-2x+\sin(\frac{\pi}{2}x) \le 0$

Published on 15 Apr 2026 - 19:05

score 134 · Answer 10 · 2026-04-16 15:57:57

If $u=\sqrt {a\cos^{2}x+b\sin^{2}x} + \sqrt {b\cos^{2}x+a\sin^{2}x}$ , find the maximum and minimum value of $u^2$.

score 95 · Answer 11 · 2026-04-14 23:23:14

95

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Finding global extrema of $a\left(\frac{1}{2}-b\frac{\sin(cx)}{x} \right) - b(1-\cos(cx))$, for $x\geq 0$

Published on 14 Apr 2026 - 23:23

score 282 · Answer 12 · 2026-04-16 07:41:54

Find value of $(\cos\frac{2\pi}{7})^ {\frac{1}{3}} + (\cos\frac{4\pi}{7})^ {\frac{1}{3}} + (\cos\frac{8\pi}{7})^ {\frac{1}{3}} $

score 183 · Answer 13 · 2026-04-16 15:37:23

Show that the general value of $\theta$ satisfying $\sin\theta=\sin\alpha$ and $\cos\theta = \cos\alpha$ is given by $\theta = 2n\pi + \alpha$

score 443 · Answer 14 · 2026-04-17 13:54:00

443

Views

Find distance AB given bearings and angles of elevation

Published on 17 Apr 2026 - 13:54

score 102 · Answer 15 · 2026-04-14 12:01:08

102

Views

Trigonometric equations: cotangent

Published on 14 Apr 2026 - 12:01

List Question

How to find the angle of a vector based on origin?

Is there an easy way to quickly prove (or memorize) inverse trig formulas such as $ \arcsin(a) = \arctan(\frac{a}{\sqrt{1-a^2}}) $?

Twice angle conditions with a point in a triangle

Why do the sines of the numerators of $\pi$’s continued fraction convergents approach zero?

Prime number and Relationship of Sequences of period 4,5,and 6

Trigonometric equations for three different regions on number line

Finding $\phi$ so that we have $3$ equal sets

Different approaches to calculating angle between two vectors

Prove $x^2-2x+\sin(\frac{\pi}{2}x) \le 0$

If $u=\sqrt {a\cos^{2}x+b\sin^{2}x} + \sqrt {b\cos^{2}x+a\sin^{2}x}$ , find the maximum and minimum value of $u^2$.

Finding global extrema of $a\left(\frac{1}{2}-b\frac{\sin(cx)}{x} \right) - b(1-\cos(cx))$, for $x\geq 0$

Find value of $(\cos\frac{2\pi}{7})^ {\frac{1}{3}} + (\cos\frac{4\pi}{7})^ {\frac{1}{3}} + (\cos\frac{8\pi}{7})^ {\frac{1}{3}} $

Show that the general value of $\theta$ satisfying $\sin\theta=\sin\alpha$ and $\cos\theta = \cos\alpha$ is given by $\theta = 2n\pi + \alpha$

Find distance AB given bearings and angles of elevation

Trigonometric equations: cotangent

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