Какое из данных равенств является тождеством: 1)a^2+8ab+16b^2=(a+8b)^2
2)a^2+8ab+16b^2=(a+4b)^2
3)a^2+8ab+16b^2=(ab+4)^2
4)a^2+8ab+16b^2=(a+2b)^2
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