$y'=\frac{e^{\left(2x+y\right)}}{e^{\left(x-y\right)}}$
$\frac{440}{2}$
$\lim_{x\to0}\left(\frac{\cos\left(3x\right)-\cos\left(x\right)}{x^3}\right)$
$\left(x-3\right)^2-3\left(x+2\right)^2+2x^2-11$
$\left(-x^2-y^2\right)^3$
$\left(5x+3\right)\left(x-1\right)$
$-2x^2-6x$
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