(a+b)^2 =a^2+2ab+b^2
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(a+b)^2 =a^2+2ab+b^2

 (a+b)2  =a2+2ab+b2

proof =

LHS- 

(a+b)2=

(a+b) (a+b)

a(a+b)+b(a+b)

a2+ab +ab+b2

a2+2ab+b2

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