1.

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

Answer» Put `x="sin"theta`
` :. dx="cos"theta"d"theta`
` :. I=int(dx)/(sqrt(1-x^(2))(1+sqrt(1-x^(2))))`
`=int("cos"theta"d"theta)/("cos"theta(1+"cos"theta))`
`=(1)/(2)int"sec"^(2)(theta)/(2)"d"theta`
`="tan"(theta)/(2)+c`
`=(2"sin"(theta)/(2)"cos"(theta)/(2))/(2"cos"^(2)(theta)/(2))+c`
`=("sin"theta)/(1+"cos"theta)+c`
`=(x)/(1+sqrt(1-x^(2)))+c`


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