$4n^2+8nm+4m^2$
$\frac{5}{9}+3.25$
$2x^2-17x+15$
$\lim_{x\to2}\left(\frac{x^2-4}{\left(x-2\right)^2}\right)$
$\left(2x^2+4\right)^3$
$y=3x^2\left(5x^{-4}+2\right)$
$-3ydx+\frac{dy}{cos3x}=0$
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