Question

Logarithmic Derivatives?

Answer 1

\(\ \Large f(\theta)=ln(cos\theta) ??\)

Answer 2

ln(x) its derivative is
(1/x)d/dx(x)

Answer 3

do the same with cosx

Answer 4

So use the Chain Rule?

Answer 5

hmm not so let me draw for u.

Answer 6

when u have to take derivatives of log functions this is formula u have to remember