Trigonometryhard · Past Paper
Simplify: sin A / (1 - cos A) if A is in the first quadrant.
Acosec A + cot A
Bcosec A - cot A
Ctan A
Dsec A
✓ Correct Answer: A — cosec A + cot A
Multiply by (1+cos)/(1+cos): sin(1+cos)/sin^2 = (1+cos)/sin = cosec A + cot A.
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