$\left(c+5\right).\left(c-9\right)$
$-2x+3\:x-5$
$\lim_{x\to0}\left(\frac{e^x-e^{-x}-2}{x-sin\left(x\right)}\right)$
$-8x+19-3x$
$-456-\left(-85\right)$
$\left(a+b\right)\left(c+d\right)-a^2;a=1,b=-2,c=3,d=-4$
$y\frac{dy}{dx}+4=2x$
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