$\lim_{x\to0}\left(\frac{\sqrt{3x+16}}{x}\right)$
$\left(a-6\:\right)\left(a\:+9\right)$
$\left(3t^7-m^2n^3\right)\left(3t^7+m^2n^3\right)$
$x^6+0+26x^4+0+225x^2+0+648$
$\frac{d}{dx}sen8x+sen\frac{x}{4}$
$x^2+4x-6=0$
$4y^2-4+1$
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