$\tan x+\tan x\cos2x=\sin2x$
$12y^2+5y-2$
$\sec\left(x\right)-\left(\tan\:\left(x\right)\cos\:\left(x\right)^2\right)$
$-3+2-3+2-3+2-3+2-3+2-3$
$-15\cdot5$
$\left(15+8\right)\cdot\left(20\right)$
$-4=2x-14$
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