$9m^2n^3,\:18m^4n^5$
$\frac{m}{\left(3+x\right)\left(6-x\right)^2}$
$\frac{2}{6}x+\frac{1}{4}x$
$y'+2y=4x\:\:\:\:\:y\left(0\right)=3$
$4t^2-100t+625=0$
$\frac{cosx}{1+cosx}=\frac{senx}{senx+tanx}$
$\frac{-4x^4+8x^2+7x-3}{x-5}$
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