$2\cos\left(x\right)-4\sin\left(x\right)\cos\left(x\right)$
$3g+5g$
$\left(-4b^5c^{-2}\right)^2$
$5+3+12-4+1+16-11-2-7$
$\left(3a+2b-c\right)\left(2a+3b+c\right)$
$\frac{3u^3v^4}{4u^2v^{-2}}$
$345-1+7$
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