$16m^2+16mn+4n^2$
$\frac{dy}{dx}+xy^3\sec\left(\frac{1}{y^2}\right)=0$
$16-4m+25m^2$
$\left(81xy+8z\right)\left(9xy-8z\right)$
$2t+46=180$
$\frac{1}{x^{2}-\frac{3}{x}}-\frac{3}{x^{3}}$
$2a+2$
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