Write the Product as a Sum or Difference of Trigonometric $- 10 \cos ( - \theta ) \sin ( - 5 \theta )$

Multiple Choice

Write the product as a sum or difference of trigonometric functions.
- $- 10 \cos ( - \theta ) \sin ( - 5 \theta )$

A) $- 5 ( \cos 6 \theta - \cos 4 \theta )$
B) $- 10 ( \cos 6 \theta + \cos 4 \theta )$
C) $5 ( \sin 6 \theta + \sin 4 \theta )$
D) $5 ( \sin 6 \theta - \sin 4 \theta )$