$\lim_{x\to0}\left(\frac{e^xsen\left(ax\right)-x}{3x^2+x^5}\right)$
$12b^2+7b$
$3x\:+\:2\:\le\:4$
$3x^2\:\frac{dy}{dx}=\:3x^2+y^2$
$\left(m+3\right)\left(m^2+3m+9\right)$
$\frac{\left(ab\right)^3}{a^2b^4}$
$\left(x^2+x+6\right)+\left(2x^2-9x-9\right)$
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