$\frac{3^{-20}}{3^{-5}}$
$\left(x+\frac{2}{3}\right)\left(x-\frac{2}{3}\right)$
$cosx\cdot cscx+sinx$
$x^2-176=0$
$h^2-\frac{3}{4}+\frac{3}{8}$
$-\left(9-5\right)-\left[4-\left(6-5\right)-9\right]$
$\lim_{x\to\infty}\left(\frac{x^2-9}{x^3-27}\right)$
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