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(a+b)²-(a-b)² = 4ab
reemplazamos.
N = [ (a+b)²-(a-b)²]²
N = [ 4ab]²
N = 16a²b². :)
x = a + b
y = a - b
[ (a+b)²-(a-b)² ]²
{ [ (a + b) + (a - b) ][ (a + b) - (a - b) ] }²
[ (a + b + a - b)(a + b - a + b) ]²
[ (2a)(2b) ]²
(4ab)²
16a²b²