$\int\frac{x^3}{\sqrt{4x^2-81}}dx$
$2x^2+7x$
$\lim_{x\to\infty}\left(\frac{x+5}{x^2+2x-1}\right)$
$6\:\sin \theta+3=0$
$-3\left(c+9\right)$
$\frac{3x}{x+1}=\frac{2}{x-1}$
$\lim_{x\to\infty}\left(\frac{2x^2-5x+7}{x+3}\right)-2x$
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