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Using the half-angle identity, cos^2 x integrates to:
Ax/2 + (sin 2x)/2
Bx/2 + (sin 2x)/4
Cx/2 - (sin 2x)/4
D(cos^3 x)/3
Answer & Solution
Correct answer: B. x/2 + (sin 2x)/4
Use cos^2 x = (1 + cos 2x)/2, which integrates to x/2 + (sin 2x)/4.
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