Trigonometrymedium · Past Paper
Simplify: sin(45° + θ) - cos(45° - θ).
A2 sin θ
B2 cos θ
C0
D1
✓ Correct Answer: C — 0
sin(45+θ) = sin 45 cos θ + cos 45 sin θ; cos(45-θ) = cos 45 cos θ + sin 45 sin θ. Subtracting them gives 0.
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