how a square + b square = (a+b) -2ab
Means
how Alpha square plus beta square is equal to hold alpha + bita square minus 2 a b
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check the attached pic..
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(a+b)^2=(a+b)(a+b)
=a(a+b)+b(a+b)
=a^2+ab+b^2+ab
=a^2+b^2+2ab
Hence Proved
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