$\int\frac{3x^2}{x^3+4}dx$
$x^2-4x+7=0$
$\lim_{x\to1}\frac{\:\:\:\:\:\:\:\:\:\:\:\:x^2+x+2}{x+1}$
$\frac{a^{-3}b^4}{c^{-2}}$
$\lim_{x\to-1}\frac{x^3+1}{x^5+x^4+x^3+x^2+x+1}$
$\frac{8x^2+16x+6}{2x+1}$
$\lim_{x\to2}\left(\frac{x^2-6x+8}{x-4}\right)$
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