$\frac{x^4-2x^3+3}{x-6}$
$9+15+448-60+12$
$2\cos2x-\sqrt{3}=0$
$4\int x\cdot e^{2x}dx$
$2a-\left(-4a+b\right)-\left\{-\left[-4a+\left(b-a\right)-\left(-b+a\right)\right]\right\}$
$2x+7\ge3x-2$
$\frac{d}{dx}\left(\left(x+y\right)^3+\left(x-y\right)^3=x^4+y^4\right)$
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