∫ dx/(1 + x²) equals:
Ax + C
Bln(1 + x²) + C
Carcsin x + C
Darctan x + C
Answer & Solution
Correct answer: D. arctan x + C
This is the standard form for arctangent: ∫ dx/(1 + x²) = arctan x + C (also written tan⁻¹ x).
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