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How to factorize the expression $4(ab+cd)^2-\left(a^2+b^2-c^2-d^2\right)^2$? [closed]
Factorise$$4(ab+cd)^2-\left(a^2+b^2-c^2-d^2\right)^2$$
I can't solve this math assignment from my text book. No one knows how to solve it, so I would be so thankful to you if you presented your step-...
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