$\int\:\frac{x}{\left(x^2-7x+10\right)}dx$
$\lim_{x\to\infty}\left(e^x\left(x-2\right)\right)$
$\int\left(x^28^{3x}\right)dx$
$7a^2b^2\left(b-4a\right)$
$\sqrt{-49}$
$7\cdot14+3$
$\frac{a^2-a-20}{a^2+a-30}$
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