Does This Integral $\int$ $\frac { \cos x } { ( 3 \sin x + 1 ) ^ { 2 } }$

True/False

Does this integral $\int$ $\frac { \cos x } { ( 3 \sin x + 1 ) ^ { 2 } }$ dx = $\frac { 1 } { 3 ( 3 \sin x + 1 ) }$ + C?