1.

Integrate int sqrt(x^2-8x+7) dx

Answer»

`1/2 (x-4) SQRT(x^2-8x+7) + 9log|x-4+ sqrt(x^2-8x+7)|+C`
`1/2 (x+4) sqrt(x^2-8x+7) + 9log|x-4+ sqrt(x^2-8x+7)|+c`
`1/2 (x-4) sqrt(x^2-8x+7) - 3sqrt2log|x-4+ sqrt(x^2-8x+7)|+c`
`1/2 (x-4) sqrt(x^2-8x+7) - 9/2log|x-4+ sqrt(x^2-8x+7)|+c`

ANSWER :D


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