$-8\left(-2\right)-20$
$\int4xe^{x^4}dx$
$sec^2x-sin^2x-cos^2x\:=\:sec^2x-1$
$\lim_{x\to0}-\left(xe^{\frac{1}{x}}\right)$
$\left(-8a+2\right)+\left(-3a-5\right)$
$x+1x-2$
$1\:+\:8r\:-\:7$
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