Evaluate the Following Integrals:
(A) $\int _ { 0 } ^ { x / 4 } \sin 2 x \sin x d x$

Essay

Evaluate the following integrals:
(a) $\int _ { 0 } ^ { x / 4 } \sin 2 x \sin x d x$ (b) $\int e ^ { x } \sin \left( e ^ { x } \right) d x$ (c) $\int _ { - 1 } ^ { 2 } \frac { x } { \sqrt { x + 2 } } d x$ (d) $\int \tan x d x$