$\left(8n^2-6n+7\right)\:\left(8n^2+6n+7\right)$
$\frac{dy}{dx}=x^3-x$
$\left(3m^4-4m^{3n}\right)^3$
$-1+\left(\frac{x^2-4x+4}{x-2}\right)\left(x+2\right)$
$x^2-2x+37$
$9x^2y-15xy-21xy$
$8\cdot3.1416$
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