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## Homework Statement

To find the INTEGRAL of 1/(x^2+d^2)^1/2 integrated with respect to dx.

d is a constant

I tried to write it as :

ln (x^2+ d^2)^1/2

but my book gives an answer of

ln { x + (x^2+ d^2)^1/2 }

i don't understand how. Can you please explain it step by step. Clearly please.