பின்வருவனவற்றில் சமனி எது?

1
(a - b) 2 = a 2 - b 2
2
(a + b) 2 = a 2 + b 2 + 2ab
3
(a + b) 2 = a 2 + b 2
4
(a - b) 2 = a 2 - b 2 - 2ab

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