Trigonometrymedium · Past Paper
Simplify: (sin A + cos A)² - 2 sin A cos A.
A0
B2
Csin² A
D1
✓ Correct Answer: D — 1
Expansion: sin² A + 2 sin A cos A + cos² A - 2 sin A cos A = sin² A + cos² A = 1.
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