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What is the antiderivative of 1/(1 + x^2) valid for all real x?
Atan^-1 x + C
Bsin^-1 x + C
Cln(1 + x^2) + C
D-1/(1 + x) + C
Answer & Solution
Correct answer: A. tan^-1 x + C
The derivative of tan^-1 x is 1/(1 + x^2).
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