Evaluate $\int _ { 0 } ^ { \pi / 2 } ( 2 \sin x - 3 \cos x ) d x$

Multiple Choice

Evaluate $\int _ { 0 } ^ { \pi / 2 } ( 2 \sin x - 3 \cos x ) d x$

A) 1
B) 0
C) -1
D) $1 / 2$