formula

\[x^{4}+2x^{3}y+3x^{2}y^{2}+2xy^{3}+y^{4}=(x^{2}+xy+y^{2})^{2}\]

'Beauty is truth, truth beauty,'-that is all Ye know on earth, and all ye need to know.
John Keats,"Ode on a Grecian Urn"





















● - ◯ - ● - ◯ - ●