(a²-b²)(c²-d²)-4abcd
batao yaar koi...
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(a2+b2-2ab) (c2+d2-2cd)-4abcd
a 2+b2-2ab c2+d2-2cd -4abcd
(a2+b2+c2)+d2(-4abcd-4abcd)
(a2+b2+c2+2ab+2bc+2ca+d2)(8abcd)
2(a2+b2+c2+d2+ab+bc+ca) I hope I can help you.
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