Які вирази є тотожно рівними?
А) a^2-b^2 і (a-b)^2
Б) (x+y)(y+x) і x^2-y^2
В) (x-3)^2 і (x-3)^2 і (x+3)^2
Г) x^2+8x+16 і (x+4)^2

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