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When the numerator is the derivative of the denominator, 2x/(1 + x^2) integrates to
A2 ln|x| + C
B1/(1 + x^2) + C
Cln(1 + x^2) + C
Dtan^-1 x + C
Answer & Solution
Correct answer: C. ln(1 + x^2) + C
The numerator 2x is the derivative of the denominator, so the integral is ln(1 + x^2).
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