You need to prove that `int_0^1 x^n/(5x+7)dx >= int_0^1 (x^(n+1))/(5x+7)dx` such that:

`x in [0,1] => x^n > x^(n+1)`

Since `5x + 7 > 0` if `x in [0,1], ` then `x^n/(5x+7) > (x^(n+1))/(5x+7), ` for`x in [0,1].`

You need to integrate the inequality x^n/(5x+7) > (x^(n+1))/(5x+7) such that:

`int_0^1 x^n/(5x+7)dx > int_0^1 (x^(n+1))/(5x+7)dx `

**Hence, using only the fact that the power function decreases over
[0,1] and the expression `5x+7` is positive for `x in [0,1], ` yields
that`int_0^1 x^n/(5x+7)dx > int_0^1 (x^(n+1))/(5x+7)dx.`**

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