$\left(3a+b\right)\left(9a^2-3ab+b^2\right)$
$\frac{cos^2x+1}{sinx^2x}+1$
$\int e^{9x}cos5xdx$
$\int\frac{\left(2x^2+3\right)}{\left(x^2\left(x-1\right)\right)}dx$
$12.50+180+0.284+1400.5$
$\int\frac{2-e^x}{e^x-1}dx$
$\int\frac{5x-2}{\left(x-1\right)^2}dx$
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