$15x^2-23x+4$
$\frac{\sqrt{n}\left(2x+1\right)^{3n}}{n^2}$
$\frac{\cos\left(5x\right)-\cos\left(9x\right)}{\cos\left(5x\right)+\cos\left(9x\right)}$
$3x-\frac{y}{2}$
$\frac{5x^3-3}{x^2+2}$
$log9+log4x^2=4$
$m^2-18m+7$
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