Question

Find the Rotation of a Rectangle that Produces a Defined Horizontal Projection Size

score 242 · Answer 1 · 2026-04-11 20:35:09

242

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Find the Rotation of a Rectangle that Produces a Defined Horizontal Projection Size

Published on 11 Apr 2026 - 20:35

score 165 · Answer 2 · 2026-04-17 02:37:58

165

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Computing $\frac{\sin(3)}{\cos(0)\cos(3)}+\frac{\sin(3)}{\cos(3)\cos(6)} +\cdots+\frac{\sin(3)}{\cos(42)\cos(45)}$

Published on 17 Apr 2026 - 2:37

score 83 · Answer 3 · 2026-04-14 16:05:59

83

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$\sin(x) - \sin(y) = -\frac{1}{3}$, $\cos(x) - \cos(y) = \frac{1}{2}$, what is $\sin(x+y)$?

Published on 14 Apr 2026 - 16:05

score 1.3k · Answer 4 · 2026-04-16 06:16:12

1.3k

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Prove that $|\sin x-x |\le \frac{1}{6}|x|^3$

Published on 16 Apr 2026 - 6:16

score 102 · Answer 5 · 2026-03-26 11:17:42

102

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If $a,b,c$ are positives such that $a+b+c=\pi/2$ and $\cot(a),\cot(b),\cot(c)$ is in arithmetic progression, find $\cot(a)\cot(c)$

Published on 26 Mar 2026 - 11:17

score 546 · Answer 6 · 2026-04-16 06:10:19

546

Views

Calculate distance between two lines from foreshortened image

Published on 16 Apr 2026 - 6:10

score 217 · Answer 7 · 2026-04-14 06:43:34

217

Views

Finding the direction vector magnitude from position and angle

Published on 14 Apr 2026 - 6:43

score 484 · Answer 8 · 2026-04-13 13:14:13

484

Views

In a pentagon $ABCDE$, $\measuredangle AED =\measuredangle BCD = 90^{\circ}$.

Published on 13 Apr 2026 - 13:14

score 57 · Answer 9 · 2026-04-09 02:25:42

57

Views

trigonometry equation calculation

Published on 09 Apr 2026 - 2:25

score 400 · Answer 10 · 2026-04-15 18:39:58

400

Views

Numerical methods for finding the roots of $f(x)=\left(\cos{\frac{33}{x}\pi}\right) (\cos{x \pi})-1$

Published on 15 Apr 2026 - 18:39

score 330 · Answer 11 · 2026-04-15 00:14:23

330

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What do "$\Sigma$" and "$\Pi$" mean in trigonometry? (Eg, $\Pi \sin \left( A - \frac{\pi}{4} \right)$ and $\Sigma \tan A$)

Published on 15 Apr 2026 - 0:14

score 135 · Answer 12 · 2026-04-16 04:24:05

135

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If $\cos x=\frac{12}{13}$ and $\sin y=\frac{7}{25}$ then what is $\cos y$ and $\sin x$?

Published on 16 Apr 2026 - 4:24

score 48 · Answer 13 · 2026-04-15 03:35:46

48

Views

"Dimension" and invariant actions on the space of metrics on $[n]$.

Published on 15 Apr 2026 - 3:35

score 129 · Answer 14 · 2026-04-14 19:34:07

129

Views

Is Clarke's astronautical geometry wrong? (solving triangles)

Published on 14 Apr 2026 - 19:34

score 103 · Answer 15 · 2026-04-14 23:47:15

103

Views

How I can evaluate this:$ \sum_{n=0}^{\infty}\arctan {(\sin(n ! ))}\, $

Published on 14 Apr 2026 - 23:47

List Question

Find the Rotation of a Rectangle that Produces a Defined Horizontal Projection Size

Computing $\frac{\sin(3)}{\cos(0)\cos(3)}+\frac{\sin(3)}{\cos(3)\cos(6)} +\cdots+\frac{\sin(3)}{\cos(42)\cos(45)}$

$\sin(x) - \sin(y) = -\frac{1}{3}$, $\cos(x) - \cos(y) = \frac{1}{2}$, what is $\sin(x+y)$?

Prove that $|\sin x-x |\le \frac{1}{6}|x|^3$

If $a,b,c$ are positives such that $a+b+c=\pi/2$ and $\cot(a),\cot(b),\cot(c)$ is in arithmetic progression, find $\cot(a)\cot(c)$

Calculate distance between two lines from foreshortened image

Finding the direction vector magnitude from position and angle

In a pentagon $ABCDE$, $\measuredangle AED =\measuredangle BCD = 90^{\circ}$.

trigonometry equation calculation

Numerical methods for finding the roots of $f(x)=\left(\cos{\frac{33}{x}\pi}\right) (\cos{x \pi})-1$

What do "$\Sigma$" and "$\Pi$" mean in trigonometry? (Eg, $\Pi \sin \left( A - \frac{\pi}{4} \right)$ and $\Sigma \tan A$)

If $\cos x=\frac{12}{13}$ and $\sin y=\frac{7}{25}$ then what is $\cos y$ and $\sin x$?

"Dimension" and invariant actions on the space of metrics on $[n]$.

Is Clarke's astronautical geometry wrong? (solving triangles)

How I can evaluate this:$ \sum_{n=0}^{\infty}\arctan {(\sin(n ! ))}\, $

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