$\left(-8p^2q\right)\left(-p^3q^4r\right)$
$x^4-2x^2y^2+y^4$
$\left(5a^x-\frac{1}{5}\right)^2$
$6x^2-12x$
$0.6x\:+\:3.4\:\le\:8.4\:+\:0.1x$
$4x^2+x-33$
$\lim_{x\to0}\left(\frac{\left(e^{-x}-e^{2x}\right)}{x}\right)$
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