Trigonometryhard · Past Paper
If cos θ + sin θ = √2 cos θ, then cos θ - sin θ is:
A√2 sin θ
Bsin θ
C√2 cos θ
D2 sin θ
✓ Correct Answer: A — √2 sin θ
Squaring both sides and rearranging leads to (cos - sin)² = 2 sin²θ.
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