$2x^{-x}$
$cosxcotx=\left(1-sin^2x\right)cscx$
$\left(2a+3b+4c\right)^3$
$5a-\left(6a-2a\right)$
$\left(c+7\right)\left(c+4\right)$
$-7\:\cdot\:4$
$10x;x=1$
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