1.

Evaluate `int(dx)/(x^(2)sqrt(1+x^(2)))`.

Answer» `I=int(dx)/(x^(2)sqrt(1+x^(2)))=int(dx)/(x^(3)sqrt(1+(1)/(x^(2))))`
Let `t=sqrt(1+(1)/(x^(2))) " or " (dt)/(dx)=(1(-(2)/(x^(3))))/(2sqrt(1+(1)/(x^(2))))`
or `(dx)/(x^(3))= -t dt`
or `I= -int(tdt)/(t)= -t +C= -sqrt(1+(1)/(x^(2))) +C`
`= - (1)/(x)sqrt(1+x^(2))+C`


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