$m=\left(x-2\right)\left(x+2\right)\left(x^2+4\right)-x^4$
$cos2x=-0.8$
$6x^2y\frac{dy}{dx}-12x^3=0$
$\frac{5x}{x^{-5}}$
$6x^2-168xy+81y^2$
$sen\left(a\right)=\frac{co}{h}$
$-2x^2-1-5$
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