Logarithmic and Trigonometric Bifunctional Derivative

Calculus Level 3

Given that \( f(x) = \ln (\cos(x) \tan(x) ) \). It is defined on the subset of reals where the expression is valid.

Find the first derivative of \(f(x)\) i.e., \( f'(x) \) at \( x = \dfrac{\pi }{4} \).

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