Evaluate: `int x/(sqrt(7x-10-x^2))\ dx`

Explanation

Here, `7 x-10-x^{2}=-(x^{2}-7 x+10)`
`

=-(x-2)(x-5) `
`

=(x-2)(5-x),` so we can apply Euler third substitution, i.e.
`

sqrt{(7 x-10-x^{2})=(x-2) t} `
`
sqrt{(}-(x-2)(x-5))=(x-2) t `
`
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