indefinite-integration

Question: $\int_{{}}^{{}}{\sqrt{{{x}^{2}}-8x+7}}\ dx=$

1) $\frac{1}{2}(x-4)\sqrt{{{x}^{2}}-8x+7}+9\log [x-4+\sqrt{{{x}^{2}}-8x+7}]+c$

2) $\frac{1}{2}(x-4)\sqrt{{{x}^{2}}-8x+7}-3\sqrt{2}\log [x-4+\sqrt{{{x}^{2}}-8x+7}]+c$

3) $\frac{1}{2}(x-4)\sqrt{{{x}^{2}}-8x+7}-\frac{9}{2}\log [x-4+\sqrt{{{x}^{2}}-8x+7}]+c$

4) None of these

Solution:

Explanation: No Explanation

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