$\frac{\left(3^5\right)\left(3^3\right)}{3^6}$
$-2x^2+4x+3=-3x^2+6x-7$
$\frac{1-\cos\left(a\right)}{1+\cos\left(a\right)}$
$\left(\sqrt{y^2+\frac{33}{4}}-2.5\right)^2$
$6x^2-3x+1$
$\frac{\sqrt{6x+h}-\sqrt{6x}}{h}$
$2y^3-2y^3+2y+4x-7x+4x-4y$
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