$-2\frac{1}{2}-4\frac{3}{4}$
$\lim_{x\to2}\left(\frac{x^2-6}{x^2+x-8}\right)$
$9m+9n$
$8a+4b-12c$
$\int-6e^{3x+1}dx$
$cos^2\left(2x\right)-cos\left(2x\right)=0$
$\lim_{x\to\infty}\left(\frac{1+x+x^3}{1+x}\right)$
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