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Trigonometry Final - Part 1 of 2
SAMPLE
This is a sample practice set. In order to have a more personalized exam prep experience:
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6. Trigonometric Identities and More Equations / Sum and Difference Identities / Problem 2
Problem 2

Rewrite the given trigonometric expression using either a sum or difference identity for cosine.
cos(9π/16)cos(5π/16) + sin(9π/16)sin(5π/16)