The integral $\int_{{\pi \over {12}}}^{{\pi \over 4}} {\,\,{{8\cos 2x} \over {{{\left( {\tan x + \cot x} \right)}^3}}}} \,dx$ equals :

Question

${{15} \over {128}}$

${{15} \over {64}}$

${{13} \over {32}}$

${{13} \over {256}}$

Please login to view the detailed solution steps...