Use a sum-to-product identity to rewrite the expression.cos (8t2) - cos (3t2)
A. -2 cos (5.5t2) cos (2.5t2)
B. -2 sin (5.5t2) sin (2.5t2)
C. -2 sin (5.5t2) cos (2.5t2)
D. -2 cos (5.5t2) sin (2.5t2)
Answer: B
Mathematics
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A. 
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