$3-2\cos^2x=2\sin2x+1$
$\left(2m-3n\right)^3$
$\frac{c^7}{c^{-1}}$
$\left(2x+z\right)\left(2x-w\right)$
$12y^8-2y^8+8y^8$
$4x^2+8x+1=5$
$-2\cdot\left(x+y\right)$
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