1.

`int(xcostheta+1)/((x^(2)+2xcostheta+1)^((3)/(2)))dx` isA. `sqrt(xcostheta+1)+C`B. `(1)/(sqrt(x^(2)2xcostheta+1))+C`C. `(x)/(x^(2)+2xcostheta+1))+C`D. `sqrt(x^(2)+2xcostheta+1)+C`

Answer» Correct Answer - C
`int(xcostheta+1)/((x^(2)+2xcostheta+1)^((3)/(2)))dx=`
`int((1)/(x^(2))costheta+(1)/(x^(3)))/((1+(2)/(x)costheta+(1)/(x^(2)))^((3)/(2)))dx`
let `1+(2)/(x)costheta+(1)/(x^(2))=t^(2)`
`(-(2)/(x^(2))costheta-(2)/(x^(3)))dx=2tdt`
`1=-int(t)/(t_(3))dt=(1)/(t)+C=(1)/(sqrt(1+(2)/(x)costheta+(1)/(x^(2)))+C`


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