$\int\frac{-x-6}{x^2+x+2}dx$
$\left(5\cdot t\cdot t^2\right)$
$\int\frac{e^u}{\left(3-e^u\right)^2}du$
$\frac{d^{2x}}{d^x}$
$\int\frac{\sqrt{x^2+25}}{4x}dx$
$7x^3+5^2+3x-2\:\:\:x^2-2x-1$
$\frac{40}{x}+\frac{x}{9}$
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