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= (2x(2x+y)+y(2x+y)) + (x+2y+1)
= ((4x²+2xy)+(2xy+y²)) + (x+2y+1)
= (4x²+2xy+2xy+y²) + (x+2y+1)
= (4x²+4xy+y²) + (x+2y+1)
Maaf kalau salah^_^