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Which logarithmic form gives the integral of 1 over the square root of x² + 1?
Aln|x + √(x² + 1)| + C
Bln|x + √(x² − 1)| + C
Cx/√(x² + 1) + C
D√(x² + 1) − x + C
Answer & Solution
Correct answer: A. ln|x + √(x² + 1)| + C
This is the standard form ∫dx/√(x² + a²) = ln|x + √(x² + a²)| with a = 1.
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