Differentiation

Answer all the questions below and press submit to see how many you got right.

id: 17573

A function is called differentiable in point $a=15$ if which of the following is true?

  • The limit $\lim \limits_{x\to 0}\frac{f(15+x)-f(15)}{x}$ exists.
    $\lim \limits_{x\to 15}f(x)=f(15).$
    $\lim \limits_{x\to 0}\frac{f(x+15)-f(x)}{x}=f(15).$
    The limit $\lim \limits_{x\to a}f(x)$ exists.
id: 17646

Which of the following statements are true for two differentiable functions $f$ and $g$?

  • $f+11$ differentiable.
    $f\cdot g$ is differentiable.
    $f\circ g$ is differentiable.
    $19\cdot(f+g)$ is differentiable.
id: 17639

Which of the following statements are true for two differentiable functions $f$ and $g$?

  • $f\cdot g$ is differentiable.
    $f\circ g$ is differentiable.
    $3\cdot(f+g)$ is differentiable.
    $f+14$ differentiable.