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Find the integral of sqrt( x^(2) + a^(2)...

Find the integral of `sqrt( x^(2) + a^(2) )` with respect to x and hence evaluate `int sqrt( x^(2) + 4x+ 6) dx`

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The correct Answer is:
`= (x+2)/( 2) sqrt( x^(2) + 4x+6) + log | (x+2)+ sqrt(x^(2) + 4x+6) | +C`
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