Use a sum-to-product identity to rewrite the expression.cos 11° - cos 39°

A. -2cos 25.0o cos (-14.0°)
B. -2cos 25.0o sin (-14.0°)
C. -2sin 25.0° cos (-14.0°)
D. -2sin 25.0° sin (-14.0°)

Answer: D

Mathematics

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