Trigonometryhard · Past Paper
If cos θ + sin θ = √2 cos θ, then cos θ - sin θ is:
A√2 sin θ
B√2 cos θ
Csin θ
DNone
✓ Correct Answer: A — √2 sin θ
Squaring both sides and using sin² + cos² = 1 leads to the result √2 sin θ.
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