Why (a+b)=a 2 +2ab+b 2
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(a+b)2=a2+2ab+b2
(a+b)(a+b)
there is a×a=a2
a×b,a×b=2ab
b×b=b2
(a+b)(a+b)
there is a×a=a2
a×b,a×b=2ab
b×b=b2
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