$\left(6a+2b\right)\left(6a-2b\right)$
$x^4\left(x^6-1\right)+11x^2-\frac{3}{x^7}-22-20\:.\:x^2$
$\lim_{x\to-\infty}\left(\frac{e^{-x}}{x^2}\right)$
$5.01\:.\:10^7$
$\frac{2y^{-3}.2y^3}{\left(2y^{-1}\right)^2}$
$\:\left(2x^{\frac{1}{3}}\right)^4$
$-\sqrt{625}$
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