$\frac{9r^4}{16}-\frac{1t^2n^6}{25}$
$2sen^23x-1=0$
$\frac{\left(x^2-x\right)^4}{\left(x^2-x\right)^2}$
$\frac{d}{dx}2\sqrt{x}+\sqrt{y}$
$7x\:and\:-9x$
$3a^2b^3\left(2a-3b\right)$
$\frac{1}{2}x^{\left(-\frac{1}{2}\right)}$
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