Use Identities to Find the Indicated Value for Each Angle $\theta = 10 ^ { \circ }$

Use identities to find the indicated value for each angle measure.
-sin ϴ = cos (4ϴ + 60°)

A) $\theta = 10 ^ { \circ }$
B) $\theta = 6 ^ { \circ }$
C) $\theta = 16 ^ { \circ }$
D) $\theta = 75 ^ { \circ }$