$\left(2a^{-1}\right)^{-2}$
$9\left(\frac{1}{\frac{3}{3}}\right)^2-8\left(\frac{1}{\frac{2}{2}}\right)^2+3$
$9x^2-12x-4x^2-8x$
$\sqrt{2-2cosx}$
$\frac{dy}{dx}=4\cdot y^2+12\cdot y+9$
$\left(7a+5b-8c\right)\left(10a-10b+5c-2\right)$
$36m^4+84m^2n+49n^2$
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