$cosx=\frac{2}{3}\:$
$\left(10r^2p^5o^3-2p^4\right)^2$
$3x^3-3x-1-x^2$
$\left(a^4b^0\right)^2\cdot b^{-2}$
$36m^2-81n^2$
$\frac{6x^4-2x^2+5x-3}{x-2}$
$-k\:+\:4\left(k\:+\:1\right)\:=\:2k\:$
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