Question

What is the derivative of `f(x) = ln(tan(x))`?

Answer 1

`(sec^2x)/tanx`

Explanation:

Using the following standard differentiation rules in conjunction :

`d/dx lnu(x)=1/u*(du)/dx`

`d/dx tanx = sec^2x`

we get that

`d/dx ln(tanx)=1/tanx*sec^2x`