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Evaluate : int (1)/(4-x^(2)) dx...

Evaluate : `int (1)/(4-x^(2)) dx`

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`int (1)/(4-x^(2))dx`
` =int (1)/(2^(2) -x^(2)) dx`
` =(1)/(2(2)) log. |(2+x)/(2-x)| +c`
`=1/4 log |(2+x)/(2-x)| +c.`
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