$\lim_{x\to\infty}\left(\frac{9+\frac{n}{n+1}}{2+\frac{1}{n}}\right)$
$9f^2+12f+36$
$sin\left(9\theta\right)sin\left(6\theta\right)$
$\:-3\left(9g-8\right)-5g$
$4x^4=100x^2$
$\left(3x^3+4ab^2\right)^2$
$4x^2-8x+17$
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