$20xx^4$
$\left(\frac{1}{4}x^3+\frac{1}{2}y^2\right)^2$
$\left(n^2+2mn+m^2\right)\left(m+n\right)$
$\left(x^{+5}\right)\left(x-5\right)$
$x'+cos\left(t\right)x=2cos\left(t\right)$
$x^2\left(1+2x-y^2\right)$
$\frac{x-1}{x+3}.\frac{x^2+4x+3}{x^2-1}$
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