$2\pi r^2+500\pi r$
$\sin\left(x\right)-2\sin\left(x\right)$
$\int\frac{5x^3-2x+9}{x^3\left(x+1\right)^2}dx$
$\int x\left(\frac{x+3}{\sqrt{-x^2-4x}}\right)dx$
$5n+5=45$
$\frac{2x^5+x^4+3x^3-3x+1}{x^3-2x-1}$
$\frac{x^3-2x^2+3x+2}{x+2}$
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