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The half-angle identity helps integrate sin²x. What is the antiderivative?
Ax/2 − sin 2x/2 + C
Bx/2 + sin 2x/4 + C
Cx − sin 2x/2 + C
Dx/2 − sin 2x/4 + C
Answer & Solution
Correct answer: D. x/2 − sin 2x/4 + C
Using sin²x = (1 − cos 2x)/2 gives x/2 − sin 2x/4.
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