taking LHS provE (A+B)²=A²+B²+2AB
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(A+B)^2
= (A+B)(A+B)
= A^2+AB+AB+B^2
=A^2+B^2 + 2AB
= (A+B)(A+B)
= A^2+AB+AB+B^2
=A^2+B^2 + 2AB
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