Question

How do you find the derivative of `ln(cos^2(x))`?

Answer 1

`-2tanx`

Explanation:

Using the chain rule:

`f'(x)=1/(cos^2x)* 2cosx * (-sinx) = -2 sinx/cosx = -2tanx`

Χαιρετισμούς από τη Σερβία :)