$2x^2-x-1=0$
$\int10x\cdot e^{-x}dx$
$\left(3x^2\:-\:2y^2\right)\:^4$
$3x^2+20x-7$
$4^2\cdot5^2$
$\lim_{x\to0}\left(\frac{\sin\left(x\right)}{\ln\left(x+1\right)\cos\left(4x\right)}\right)$
$\frac{d}{dx}\ln3x+7$
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