$\frac{d^2}{dx^2}\left(4x^2+9y^2=36\right)$
$x^2-81x+81=0$
$\frac{x^3-6x-10}{x-3}$
$m^4\:+\:2m^2n^2\:+n^4$
$x+2\cdot4$
$\lim x\to inf\left(\frac{ln\left(e^{3x}+x\right)}{x^1}\right)$
$4xy\frac{dy}{dx}=y^2+1$
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