Find the integrals of the functions $\frac{1}{\cos(x-a)\cos(x-b)}$

Question

$\begin{array}{1 1} \frac{log\mid \frac{\cos(x-a)}{\cos(x-b)}\mid}{\sin(a-b)}+c \\ \frac{log\mid \frac{\cos(x-a)}{\sin (x-b)}\mid}{\sin(a-b)}+c \\ \frac{log\mid \frac{\cos(x-a)}{\cos(x-b)}\mid}{\cos (a-b)}+c \\ \frac{log\mid \frac{\sin (x-a)}{\cos(x-b)}\mid}{\cos (a-b)}+c\end{array}$