$x^{3\:}-13x^2+36x$
$a^2+7a+5a+2a^2+3a$
$\frac{\cos\left(x\right)+\cos\left(y\right)}{\sin\left(x+y\right).\sin\left(x-y\right)}$
$\frac{3x^{4}-2x^{3}+5x^{2}+x+1}{x-1}$
$8-z=9$
$x^2-14x+36$
$\frac{d}{dx}3x^6-x^4+6$
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