$n^2-3n-208=0$
$\frac{d}{dx}\frac{e^x-1}{1+e^{-x}}$
$\int\frac{1}{x\sqrt{x^2-225}}dx$
$x\left(4x-7\right)$
$\left(sec\left(x\right)\right)^2-1=1$
$\int_{\frac{\pi}{3}}^{\frac{\pi}{2}}2cot3xdx$
$x-6\:+3x\:+4$
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