$\left(x^4-4x^3+8x^2-11x+6\right)\left(x^2-x+3\right)$
$\left(3x-4y\right)\left(y+3x\right)$
$7-y^3+y^3+5y^2-4y^2+y^2-2$
$\frac{\left(k\right)\left(k+1\right)}{2}+\:k+1$
$\left(5x-4y\right)^3$
$x\:y'\:=\:sqrt\left(x\:y\right)+y$
$\left(6x^2y-11z\right)^2$
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