$45n^4-125$
$5x^2-10xy$
$9x^2-12y=0$
$\left(13x^3-9y^5\right)\left(13x^3+9y^5\right)$
$\:\left(tanb-1\right)^2$
$6xz-16y-24+4xy$
$b\left(4+8t+4t^2\:\right)$
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