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Sum and Difference Identities

12. Trigonometric Identities / Sum and Difference Identities / Problem 2

Problem 2

Determine the exact value of the following expression by using a sum or difference identity:
sin 645°

A

-(√6 + √2)/4

B

(√6 - √2)/4

C

(√3)/4

D

-(√3 + √2)/2