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What is int(dx)/(sqrt(x^(2)+a^(2))) equa...

What is `int(dx)/(sqrt(x^(2)+a^(2)))` equal to

A

`ln|(x+sqrt(x^(2)+a^(2)))/(a)|+c`

B

`ln|(x-sqrt(x^(2)+a^(2)))/(a)|+c`

C

`ln|(x^(2)+sqrt(x^(2)+a^(2)))/(a)|+c`

D

None of these

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The correct Answer is:
A
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