If f'(x) = cos 2x, then f(x) is
A-sin 2x/2 + C
Bsin 2x/2 + C
Csin 2x + C
D2 sin 2x + C
Answer & Solution
Correct answer: B. sin 2x/2 + C
Differentiating sin 2x/2 gives cos 2x, so the factor 1/2 comes from the inner function 2x.
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