$\frac{dy}{dx}\left(y=\frac{2x^4}{b^2-x^2}\right)$
$3x^2+2y^2+12y-24x+60=0$
$\lim_{n\to+\infty}\left(1-e^{-nx}\right)$
$x2+7x+18$
$\frac{a^5-2^5}{a-2}$
$49k^2-56k+4$
$\left(-12000\right)-12000$
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