$\frac{10x^5+20x^3+5x}{5x}$
$\frac{x^{12}-9x^{6}+14}{x^{6}-2}$
$\left(7x\right)\:-\:\left(9y\right)^2$
$5x-2x^2+x\left(3x-4\right)$
$sin\left(-\frac{9}{41}\right)cos\left(\frac{3}{5}\right)-cos\left(\frac{40}{41}\right)sin\left(\frac{4}{5}\right)$
$y^4-2y^2-63$
$\lim_{x\to0}\left(7x^{2x}\right)$
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