Trigonometryeasy · Past Paper
Which of these is the same as sin(A)?
A√(1 - cos² A)
B√(1 + cos² A)
C1 / sec A
Dtan A / cos A
✓ Correct Answer: A — √(1 - cos² A)
From sin² A + cos² A = 1, sin A = ±√(1 - cos² A).
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