$50x^2-20x+2$
$3-5+8-1+3+1-8$
$\frac{x^4+1x^2-4}{x^2+x+1}$
$\frac{dy}{dx}=y^2\left(1-e^{-x}\right)$
$cos\:x\:-2sin^2x+1$
$-3x^2+3x$
$\frac{\sin\left(a\right)}{1-\cos\left(a\right)}-\cot\left(a\right)$
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