$-2\cdot\frac{d^2y}{dx^2}+1=0$
$27x^3y^9-125x^6y^3$
$\tan^2+\:1\:=\frac{1}{\cos}$
$\left(a+c\right)^5$
$\tan dx+\left(x+1\right)dy=0$
$\lim_{x\to-3}\left(x-1\right)$
$8x^3y^2-14x^3y^2-5+x^3y^2+8$
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