$-1\cdot\frac{6}{3}$
$\left(\tan x\:+2\right)\left(2\:\tan x\:+1\right)=5\:\tan x\:+2\sec^2x$
$-\left(3\:-2\:+\:7\right)\:+\:\left(-5\:+\:4\:-\:6\:+\:2\right)+\:8$
$-5\left(cot^2x-csc^2x\right)$
$-3x^2+2xy+1y^2$
$\sec^2x+3\tan x+1$
$5x+3xy-5x$
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