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Integrate the functionssqrt(4-x^2)...

Integrate the functions`sqrt(4-x^2)`

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`" Let I " = int sqrt(4-x^(2)) dx= int sqrt(2^(2)-x^(2))dx`
`=(x)/(2) sqrt(4-x^(2)) +(4)/(2)sin^(-1) .(x)/(2) +C`
` =(x)/(2) sqrt(4-x^(2))+2sin^(-1) .(x)/(2) +C`
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