$5\cdot1+7\cdot3+6\cdot0$
$1.1+2.2+3.3+4.4+13.2$
$\frac{\left(x^4+81\right)}{\left(x-3\right)}$
$\frac{d}{dx}\left(\frac{2x-3y}{z-2y}+xz^2\right)$
$\frac{\left(1+\cot\:^2\left(x\right)\right)}{2\cdot cot\left(x\right)}$
$\left(x+\frac{3}{x}\right)^4$
$x^2-6x-11=0$
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