1.

Evaluate:`int(sqrt(x)dx)/(1+x)`

Answer» Correct Answer - `2sqrt(x)-2tan^(-1)sqrt(x)+C`
` " Put " x=t^(2) or dx=2tdt.` Then,
`int(sqrt(x)dx)/(1+x)=2int(t^(2)dt)/(1+t^(2)) `
` =2int(1-(1)/(1+t^(2)))dt `
`=2(t-tan^(-1)t)+C`
` =2sqrt(x)-2tan^(-1)sqrt(x)+C`


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