$\left(\frac{x}{2}-\frac{y}{3}\right)^4$
$\left(x^6+12x^3+36\right)\left(x^6-16x^3+64\right)$
$-32+-45-2$
$\frac{dy}{dx}=\frac{x^2y^2+x^2+y^2+1}{xy+y}$
$\text{tanq}=1.5$
$\frac{\frac{1}{9}+\frac{1}{x}}{9+x}$
$cos\left(2x\right)-cos\left(4x\right)=sqrt\left(3\right)\:sen\left(3x\right)$
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