$y\:+\:6\:=\left(x\:+\:3\:\right)^2$
$n^2+18n$
$\sin^4x-\cos^4x+\cos\left(2x\right)$
$2x=x^2-x+2$
$5x^{-3}yz^2$
$4x+3+2x+1$
$\left(-3y^2-8\right)-\left(-5y^2\right)$
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