$\int\frac{x^2+2x-1}{x^3+x}dx$
$\int e^{6x-7}dx$
$\cos\left(\frac{3}{5}-\frac{7}{25}\right)$
$\int\left(9x^4-7\right)^2dx$
$-8a^x+13a^x$
$250x^2-40$
$\frac{5x^3+8x^2+3x+18}{-x^2-2}$
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