Complete the identity.sin (? + ?) sin (? - ?) = ?
A. cos2 ? - cos2 ?
B. sin2 ? - sin2 ?
C. sin2 ? - cos2 ?
D. cos2 ? + cos2 ?
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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A. 
B. 
C. 
D. 
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A. 1522 B. 1502 C. 1512 D. 1506
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