$\:\lim_{x\to1}\frac{\sqrt{x+3\:\:\:}\:}{x-1}-2$
$x^2\frac{dy}{dx}-4xy=-7x$
$\left(\frac{3}{2}+\frac{1}{2}x^2\right)^2$
$\left(x-1\right)\left(x-6\right)$
$f\left(x\right)=x\left(18-x\right)$
$12j+2j-4+3j^2$
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