$x^3\frac{dy}{dx}+2y=x$
$\lim_{x\to4}\left(\frac{\sqrt{x^2-7}}{x-1}\right)$
$6x^2-16x-6$
$if\:y=sin\:x$
$\left(a+2\right)^2+\left(a-2\right)^2-2\left(a+3\right)^2$
$5x+2y=4$
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