$\lim_{x\to a}\left(\frac{sin\:x}{x^n}\right)$
$x^2+y^2+2xy;\:x=1\:;\:y=2$
$a^{-2}b^{-2}\left(a^{-1}b^{-1}\right)^2$
$3a^3+6a^2+12$
$8z^2-18z+9$
$\left(g+\sqrt{3}\right)\left(g-3\right)$
$\int\frac{xd}{x^2+7x+6}$
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