$\frac{dz}{dt}=5e^{t+z}$
$\:\left(\frac{2}{5}x^2+\frac{1}{3}xy+\frac{2}{7}y^2\right)\left(\frac{2}{5}x^2-\frac{1}{3}xy+\frac{2}{7}y^2\right)$
$-4<x+1$
$6\left(2\right)^x-73=23$
$4\cos\left(x\right)=\sqrt{2}$
$\lim_{x\to-\infty}\left(\frac{xe^{2x}}{2}\right)$
$\lim_{x\to\infty}\left(\frac{7x^2-5}{4x-7}\right)$
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