Trigonometrymedium · Past Paper
Simplify: (cos A - sin A)(cos A + sin A).
A1
Bcos 2A
Csin 2A
D0
✓ Correct Answer: B — cos 2A
The product is cos² A - sin² A, which is the formula for cos 2A.
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✓ Correct Answer: B — cos 2A
The product is cos² A - sin² A, which is the formula for cos 2A.
Share this question