$\left(-0.5\right)^2$
$81x^2-400^4$
$\left(2x^4+5x\right)^5$
$3x^2\:+\:4y\:-\:2x^2\:-x^2$
$6x^2+3+21x$
$y=x+ae^x+be^-x$
$\left(za-bz\right)^2$
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