$3m^2n^2-9mn^2$
$\left(2x-3\right)^n\cdot\:\frac{1}{2n-1}$
$\lim_{x\to2}\left(\sqrt{x^2+3x-1}\right)$
$\left(2a+4\right)\left(a-4\right)$
$12\sqrt{7-8\sqrt{7+9\sqrt{7=\left(12-78+9\right)}\cdot\sqrt{7=13\sqrt{7}}}}$
$\left(2k+2\right)^3$
$\left(\sqrt{1+\frac{9}{16x^{\frac{1}{2}}}}\right)$
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