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When the numerator 2x is the derivative of the denominator x² + 1, the integral takes which form?
Aln(x² + 1) + C
Btan⁻¹x + C
C2 ln(x² + 1) + C
D1/(x² + 1) + C
Answer & Solution
Correct answer: A. ln(x² + 1) + C
The numerator is the derivative of the denominator, so the integral is the log of the denominator.
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