$2sec^2+tan^2x-3$
$\lim_{x\to0}\left(\frac{\sqrt[3]{1+x^2}-\sqrt[4]{1-2x}}{x+x^3}\right)$
$20x=-5x^2$
$c^2-15c-100$
$\int\frac{25}{\sqrt{14x-x^2}}dx$
$3cot^2\left(\frac{2\pi}{3}\right)$
$xy-6=0$
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