Question

What is the derivative of `f(x) = -2lnx`?

Answer 1

`f'(x)=-2/x`

Explanation:

Know that `d/dx[lnx]=1/x`.

This is a very important identity.

`f'(x)=-2d/dx[lnx]`

`=>-2(1/x)`

`=>-2/x`