a² - 2ab + b² - d² : Factorize
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(a -b )2 =a2 -2ab +b2
(a-b)2 -d2
a2 -b2 =(a+b)(a-b)
a=a-b , b=d
(a-b+d)(a-b+d)
(a-b)2 -d2
a2 -b2 =(a+b)(a-b)
a=a-b , b=d
(a-b+d)(a-b+d)
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