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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