Trigonometryhard · Past Paper
Simplify: cos³ A sin 3A + sin³ A cos 3A.
A3/4 sin 4A
B3/4 cos 4A
Csin 4A
Dcos 4A
✓ Correct Answer: A — 3/4 sin 4A
Using triple angle identities and expansion, the expression simplifies to (3/4) sin 4A.
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