$\sin\left(90.1\right)$
$\frac{2x^4+6x-3}{2x-4}$
$4+-13+-8$
$\frac{x^2+2x+8}{x^4-4x^2}$
$\lim_{x\to0}\left(\frac{e^2-1}{x^2+2x}\right)$
$\left(4z\right)^2$
$\left(y-4x-1\right)^2dx-dy$
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