$\frac{4^4.27^2.8^3.81^2}{16^2.27^5.4^6.9^1}$
$25x^2-20xy$
$4^3\cdot4^{\left(-7\right)}$
$25-x^2\le0$
$\lim_{x\to0}\left(\frac{\ln\left(x+1\right)\ln\left(3\right)}{x-2}\right)$
$4cos^2\left(2\pi\right)-3sin^2\left(2\pi\:\right)$
$3h+h-5h+8h$
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