$\frac{d^2}{dx^2}\left(x^2+4y^2=16\right)$
$225a^2-1444b^2$
$2x^2-10x-12\ge0$
$125\cdot\:3\times\:10^{-6}$
$\int\frac{3x}{e^2^x}dx$
$w^2-\:2w\:-\:15$
$\lim_{x\to0}\left(\frac{x^3+4x^2-5x+2}{x^3-3x+2}\right)$
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