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Question

Write any three identities.

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Solution

Following are three identities:

(1) (a + b)2 = a2 + b2 + 2ab
(2) (a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca
(3) (a + b)3 = a3 + b3 + 3ab2 + 3a2b

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