Use Integration Tables to Evaluate the Integral $\int _ { 0 } ^ { \pi / 2 } 21 x \cos x d x$

Multiple Choice

Use integration tables to evaluate the integral $\int _ { 0 } ^ { \pi / 2 } 21 x \cos x d x$

A) $21 \pi$
B) $\frac { 21 \pi } { 2 }$
C) $21 \left( \frac { \pi - 1 } { 2 } \right)$
D) $21 ( \pi - 1 )$
E) $21 \left( \frac { \pi } { 2 } - 1 \right)$