Trigonometrymedium · Past Paper
Simplify: sin(A+B)sin(A-B).
Asin^2 A - sin^2 B
Bcos^2 A - cos^2 B
Csin^2 A + sin^2 B
D1
✓ Correct Answer: A — sin^2 A - sin^2 B
Standard identity: sin(A+B)sin(A-B) = sin^2 A - sin^2 B.
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✓ Correct Answer: A — sin^2 A - sin^2 B
Standard identity: sin(A+B)sin(A-B) = sin^2 A - sin^2 B.
Share this question