`int (dx)/(x^(2)+a^(2))=`A. `(1)/(a)tan^(-1)""(x)/(a)+k`B. `(1)/(a)tan – InterviewSolution

1.	`int (dx)/(x^(2)+a^(2))=`A. `(1)/(a)tan^(-1)""(x)/(a)+k`B. `(1)/(a)tan^(-1)(x+a)+k`C. `sin^(-1)""(x)/(a)+k`D. `cos^(-1)""(x)/(a)+k`
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