$f\left(x\right)=\:e^{-x}\cdot\left(x+2\right)$
$85\:+\:-17\:+\:-17\:+\:-1$
$\lim_{x\to\infty}\left(\csc\left(\frac{1}{x}\right)^{\frac{1}{8^x}}\right)$
$x^2+y^2=3x^2-6y$
$-\left(2\right)^2-2+3$
$2x\:-\:2\:+\:4\:$
$9x^5y^7+3x^2y^2$
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