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Evaluate: int1/(sqrt(7-6x-x^2))\ dx...

Evaluate: `int1/(sqrt(7-6x-x^2))\ dx`

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`I=int1/(sqrt(7-6x-x^2))\ dx`
`I=int1/(sqrt(7-6x-x^2+9-9))\ dx`
`I=int1/(sqrt(16-(x^2+6x+9))\ dx`
`I=int1/(sqrt(4^2-(x+3)^2))\ dx`
`I=sin^(-1)(x+3)/4+C`
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