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741.

$\int \frac{dx}{x (x^{7} + 1)}$ is equal to

742.

$\int_{- 1}^{1} |1 - x| dx$ is equal to

743.

$\int \sqrt{x} e^{\sqrt{x}} dx$ is equal to

744.

$\int \frac{dx}{x^{2} + 2 x + 2}$ is equal to

745.

$\int_{0}^{2 π} (\sin (x) + |\sin (x)|) dx$ is equal to

746.

$\int_{0}^{π} \frac{xdx}{a^{2} \cos^{2} (x) + b^{2} \sin^{2} (x)} dx$ is equal to

747.

$\int e^{x} (\frac{1 + \sin (x)}{1 + \cos (x)}) dx$ is equal to

748.

$\int \sqrt{1 + \sin (\frac{x}{4})} dx$ is equal to

749.

$\int_{0}^{\infty} \frac{xdx}{(1 + x) (1 + x^{2})}$ is equal to

750.

If I_n = $\int {(\log (x))}^{n} dx$ , then I_n + nI_{n - 1} is equal to