$\left(25m^2-30mn+9n^2\right)$
$\left(\frac{3}{x}+y^2\right)^2$
$\lim_{x\to0}\left(\frac{\frac{1}{x+e}}{x}\right)$
$\frac{x^2+15}{\left(x+3\right)^2}$
$16a^2+24ab+8b^2$
$\int\sqrt{x^2+4}\cdot\frac{1}{x^4}dx$
$5\:\:-a=-39$
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