Question
$\int_{}^{} {\frac{{dx}}{{{{(2\sin x + \cos x)}^2}}}} = $
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$(A)$ $\int^{\pi / 4} x f(x) d x=\frac{1}{12}$
$(B)$ $\int_0^{\pi / 4} f(x) d x=0$
$(C)$ $\int_0^{\pi / 4} x f(x) d x=\frac{1}{6}$
$(D)$ $\int_0^{\pi / 4} f(x) d x=1$