$288x^3y^4-72x^2y^2+168x^5y$
$\left(2xseny+2x+3ycosx\right)dx\:+\left(x^2cosy+3senx\right)dy=0$
$4x-1>3-2.\left(7-x\right)$
$\lim_{x\to0}\frac{e^{6x}-1-6x}{1+x^2-\cos\left(x\right)}$
$\frac{9}{x^2-3x-18}$
$\frac{4x^3+5x+2}{x+1}$
$\frac{du}{dv}=\frac{\left(3u-2v\right)^2}{\left(2u-3v\right)^2}$
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