$\frac{dy}{dx}=\frac{x-2y}{-2x-y}$
$\frac{d}{dx}7cosx$
$x y ^ { 2 } = 9$
$\left(-4x^4y^3\right)\left(5x^7y^2\right)$
$144=\left(x+y\right)^2$
$\lim_{x\to1}\left(\frac{x^7-1}{x-1}\right)$
$3z-6x+2y-0.2+5$
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