Rewrite as a Single Expression $\theta$ )Cos(2 $\theta$ ) + Sin(6 $\theta$ )Sin(2 $\theta$

Multiple Choice

Rewrite as a single expression. cos(6 $\theta$ ) cos(2 $\theta$ ) + sin(6 $\theta$ ) sin(2 $\theta$ )

A) cos(8 $\theta$ )
B) cos(4 $\theta$ )
C) sin(8 $\theta$ )
D) sin(4 $\theta$ )