Question

Given $f$ find $θ$ and show that $f$ is not differentiable at $x_0=0.$

score 23 · Answer 1 · 2018-04-17 12:38:10

23

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Given $f$ find $θ$ and show that $f$ is not differentiable at $x_0=0.$

Published on 17 Apr 2018 - 12:38

score 36 · Answer 2 · 2018-04-17 14:40:14

36

Views

Additions of sines.

Published on 17 Apr 2018 - 14:40

score 63 · Answer 3 · 2026-03-27 03:42:18

63

Views

How long does it take this object to arrive at the point $M$? Assume that $|KL| =|LM|$.

Published on 27 Mar 2026 - 3:42

score 94 · Answer 4 · 2026-03-25 07:44:08

94

Views

Can there be a trigonometric function reaching any finite number of points in $\mathbb{R} ^2$

Published on 25 Mar 2026 - 7:44

score 1.6k · Answer 5 · 2026-03-24 20:33:24

1.6k

Views

Find the extrema of $\sin(x)\cos(y)$ with the Hessian

Published on 24 Mar 2026 - 20:33

score 80 · Answer 6 · 2018-04-17 22:33:07

80

Views

Solving $\sin \frac12x =-3 \cos 2x$

Published on 17 Apr 2018 - 22:33

score 93 · Answer 7 · 2018-04-18 01:34:34

If $\frac{b+c}{2k-1}=\frac{c+a}{2k}=\frac{a+b}{2k+1}$, then $\frac{\sin A}{k+1}=\frac{\sin B}{k}=\frac{\sin C}{k-1}$

score 1.7k · Answer 8 · 2026-03-25 23:39:21

1.7k

Views

$\lim_{x\rightarrow \frac{\pi }{3}}\frac {\sin x-\sqrt {3}\cos x}{\sin 3x}$ has two different values?

Published on 25 Mar 2026 - 23:39

score 1.5k · Answer 9 · 2018-04-18 13:39:32

1.5k

Views

Is it possible to find value of $~\cos 180^{\circ}~$ and $~\cos 360^{\circ}~$ with the reference angle method?

Published on 18 Apr 2018 - 13:39

score 123 · Answer 10 · 2026-03-27 15:31:36

123

Views

Why are these $\sum \cos$ and $\csc$ equivalent?

Published on 27 Mar 2026 - 15:31

score 315 · Answer 11 · 2026-04-01 17:07:57

315

Views

Integrate $\sin(\cos x)\text{d}x$

Published on 01 Apr 2026 - 17:07

score 363 · Answer 12 · 2026-03-28 04:35:41

363

Views

Finite sum $\sum_{k=1}^{p-1} \frac{1-\cos\left(\frac{2\pi k r}{p}\right)}{1-\cos\left(\frac{2\pi k s}{p}\right)}$ for $\gcd(p,rs)=1$.

Published on 28 Mar 2026 - 4:35

score 202 · Answer 13 · 2018-04-18 19:16:35

202

Views

Baffled with $\lim\limits_{x\to 0}{e^x-e^{\sin x} \over x-\sin x}$

Published on 18 Apr 2018 - 19:16

score 172 · Answer 14 · 2026-03-27 21:16:48

172

Views

Questions about finding the angle between two vectors

Published on 27 Mar 2026 - 21:16

score 76 · Answer 15 · 2018-04-19 10:08:21

76

Views

Solving trigonometrical equations

Published on 19 Apr 2018 - 10:08

List Question

Given $f$ find $θ$ and show that $f$ is not differentiable at $x_0=0.$

Additions of sines.

How long does it take this object to arrive at the point $M$? Assume that $|KL| =|LM|$.

Can there be a trigonometric function reaching any finite number of points in $\mathbb{R} ^2$

Find the extrema of $\sin(x)\cos(y)$ with the Hessian

Solving $\sin \frac12x =-3 \cos 2x$

If $\frac{b+c}{2k-1}=\frac{c+a}{2k}=\frac{a+b}{2k+1}$, then $\frac{\sin A}{k+1}=\frac{\sin B}{k}=\frac{\sin C}{k-1}$

$\lim_{x\rightarrow \frac{\pi }{3}}\frac {\sin x-\sqrt {3}\cos x}{\sin 3x}$ has two different values?

Is it possible to find value of $~\cos 180^{\circ}~$ and $~\cos 360^{\circ}~$ with the reference angle method?

Why are these $\sum \cos$ and $\csc$ equivalent?

Integrate $\sin(\cos x)\text{d}x$

Finite sum $\sum_{k=1}^{p-1} \frac{1-\cos\left(\frac{2\pi k r}{p}\right)}{1-\cos\left(\frac{2\pi k s}{p}\right)}$ for $\gcd(p,rs)=1$.

Baffled with $\lim\limits_{x\to 0}{e^x-e^{\sin x} \over x-\sin x}$

Questions about finding the angle between two vectors

Solving trigonometrical equations

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