$\lim_{x\to0}\left(\frac{1-e^{xy}}{x^2+y^2}\right)$
$4 x - 2 ( x - 3 ) \geq 0$
$\sin\left(x\right)\cos\left(x\right)=\sin\left(2x\right)$
$811.1445-240$
$\frac{x}{x^2-7x+12}-\frac{4}{x^2-7x+12}$
$\lim_{x\to3}\left(x^2+4x-2\right)$
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