$cos\left(180-x\right)$
$\int\frac{105}{x^2-18x-17}dx$
$\frac{dy}{dx}=40-0.08x$
$\lim_{x\to1}\left(\frac{x^2-2x+1}{x^2+4x-3}\right)$
$\left(-3x^4y\right)\left(5x^5y^4-3x^4y^3z+4xz^4\right)$
$\int\:\frac{100}{36+25x^2}dx$
$\frac{6-57x+2x^3+5x^2}{x-4}$
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