# Choose the correct answer in $\Large \int \normalsize\frac{dx}{\sin^2x\cos^2x}$ equals
$\begin{array}{1 1} (A)\;\tan x+\cot x+C & (B)\;\tan x-\cot x+C\\(C)\;\tan x\cot x+C & (D)\;\tan x-\cot2x+C\end{array}$