Primitive of Reciprocal of Sine of x by Cosine of x

Theorem

 * $\ds \int \frac {\d x} {\sin x \cos x} = \ln \size {\tan x} + C$

Proof
From Primitive of $\dfrac 1 {\sin a x \cos a x}$:
 * $\ds \int \frac {\d x} {\sin a x \cos a x} = \frac 1 a \ln \size {\tan a x} + C$

The result follows by setting $a = 1$.