Trigonometrymedium · Past Paper
Using compound angle formulas, sin(A + B) is equal to:
Asin A cos B + cos A sin B
Bsin A sin B + cos A cos B
Csin A cos B - cos A sin B
Dcos A cos B - sin A sin B
✓ Correct Answer: A — sin A cos B + cos A sin B
This is the standard expansion formula for the sine of the sum of two angles.
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