$y^8-5y^4+4$
$2a^2-\frac{5}{4}a+a-3a^2-6a^2$
$h ( t ) = \sqrt { t } ( 1 - t ^ { 2 } )$
$10-\left\{-20+30-60+\left[-\left(-40+70-20\right)-10\right]\right\}$
$\left[\left(7a^{4\:}-3a^3-8a\right)+5a^3\right]-\left[-\left(11a^4+2a^3\right)\right]$
$\frac{3}{2}ty\left(t\right)\left(1-\frac{y\left(t\right)}{500}\right)$
$\frac{d^2}{dx^2}\frac{x^3}{1-x}$
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