1.

Integration of f (x) `= sqrt(1+x^(2))` with respect to `x^(2)`, isA. `(2)/(3)((1+x^(2))^(3//2))/(x)+C`B. `(2)/(3)(1+x^(2))^(3//2)+C`C. `(2x)/(3)(1+x^(2))^(3//2)+C`D. none of these

Answer» Correct Answer - b
Let `I=intf(x)d (x^(2))=intsqrt(1+x^(2))d(x^(2))`
`rArrI=intsqrt(1+x^(2))d(1+x^(2))` " " `[becaused(x^(2))=d(1+x^(2))]`
`rArrI=(2)/(3)(1+x^(2))^(3//2)+C`


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