$\int\sec^{2}\left(x\right)dx$
$3x^2\left(4x+5\right)$
$\lim_{x\to+\infty}\frac{e^x+e^{-x}}{e^x-e^{-x}}$
$\frac{x^2}{4+x^2}$
$\frac{dy}{dx}+\sin\left(x+y\right)=0$
$\int\left(\frac{2}{x^2+8x+17}\right)dx$
$-4<5r-102$
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