Question

if neither f nor g is differentiable at x=a. is $f+g$ differentiable at $x=a$?(2)

score 1k · Answer 1 · 2026-04-14 21:31:59

1k

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if neither f nor g is differentiable at x=a. is $f+g$ differentiable at $x=a$?(2)

Published on 14 Apr 2026 - 21:31

score 364 · Answer 2 · 2026-04-16 02:05:37

364

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Differentiability and derivative of $|x|^3$ at $x=0$

Published on 16 Apr 2026 - 2:05

score 302 · Answer 3 · 2026-04-29 20:56:29

302

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Can we conclude that $f$ is continuous on the interval $[a,b]$?

Published on 29 Apr 2026 - 20:56

score 56 · Answer 4 · 2026-04-16 03:16:55

56

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Showing that $J(W) = || S w || - \frac{1}{2} w^T S w$ is maximized only when $||w| = 1$

Published on 16 Apr 2026 - 3:16

score 145 · Answer 5 · 2026-04-25 03:44:35

145

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Finding the local extreme values of $f(x) = -x^2 + 2x + 9$ over $[-2,\infty)$.

Published on 25 Apr 2026 - 3:44

score 38 · Answer 6 · 2026-04-13 04:39:00

38

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Meaning of derivative in terms of the original function

Published on 13 Apr 2026 - 4:39

score 199 · Answer 7 · 2026-04-15 23:16:08

199

Views

If a function has a local extremum at the point $(x_0,y_0)$ along every line, then does the function have a point of extremum?

Published on 15 Apr 2026 - 23:16

score 158 · Answer 8 · 2026-04-17 01:56:04

158

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If $p^2=a^2\cos^2\theta +b^2\sin^2\theta$ ,then show that $p+\frac{d^2p}{d\theta ^2}=\frac{a^2b^2}{p^3}$

Published on 17 Apr 2026 - 1:56

score 1.1k · Answer 9 · 2026-04-16 08:41:39

1.1k

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Finding directional derivative given direction and point

Published on 16 Apr 2026 - 8:41

score 125 · Answer 10 · 2026-04-12 14:45:03

125

Views

Matrix relative to a Linear Transformation. Diagonal Matrix.

Published on 12 Apr 2026 - 14:45

score 317 · Answer 11 · 2026-04-13 04:08:18

317

Views

Integration by parts in the time derivative of a functional

Published on 13 Apr 2026 - 4:08

score 69 · Answer 12 · 2026-04-14 22:35:04

69

Views

Calculating $\frac{\partial x }{\partial r}$ if $r^2 = x^2 + y^2 +z^2$

Published on 14 Apr 2026 - 22:35

score 38 · Answer 13 · 2026-04-16 04:11:52

38

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How to Calculate the gradient of $y=(4-2x^2)^5$ at the point where $x=1$

Published on 16 Apr 2026 - 4:11

score 32 · Answer 14 · 2026-04-16 19:09:24

32

Views

Find minimum value: Drawing a graph vs differentiation?

Published on 16 Apr 2026 - 19:09

score 672 · Answer 15 · 2026-04-15 20:06:40

672

Views

$f:[0,1] \to \mathbb R$ be a differentiable function with bounded derivative, then is $\int_0^1 f'(x)=f(1)-f(0)$?

Published on 15 Apr 2026 - 20:06

List Question

if neither f nor g is differentiable at x=a. is $f+g$ differentiable at $x=a$?(2)

Differentiability and derivative of $|x|^3$ at $x=0$

Can we conclude that $f$ is continuous on the interval $[a,b]$?

Showing that $J(W) = || S w || - \frac{1}{2} w^T S w$ is maximized only when $||w| = 1$

Finding the local extreme values of $f(x) = -x^2 + 2x + 9$ over $[-2,\infty)$.

Meaning of derivative in terms of the original function

If a function has a local extremum at the point $(x_0,y_0)$ along every line, then does the function have a point of extremum?

If $p^2=a^2\cos^2\theta +b^2\sin^2\theta$ ,then show that $p+\frac{d^2p}{d\theta ^2}=\frac{a^2b^2}{p^3}$

Finding directional derivative given direction and point

Matrix relative to a Linear Transformation. Diagonal Matrix.

Integration by parts in the time derivative of a functional

Calculating $\frac{\partial x }{\partial r}$ if $r^2 = x^2 + y^2 +z^2$

How to Calculate the gradient of $y=(4-2x^2)^5$ at the point where $x=1$

Find minimum value: Drawing a graph vs differentiation?

$f:[0,1] \to \mathbb R$ be a differentiable function with bounded derivative, then is $\int_0^1 f'(x)=f(1)-f(0)$?

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