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Taking a, b, c as positive integers, ver...

Taking a, b, c as positive integers, verify the following whether they are identities or not? `(a+b+c)^2`=`a^2`+ `b^2`+`c^2`+2ab + 2bc + 2ca.

A

`(a+b+c)^2`

B

`(a-b-c)^2`

C

`(2a-b-c)^2`

D

`(a - b)^2`

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