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Question Number 138477 by mathlove last updated on 14/Apr/21

Answered by Ñï= last updated on 14/Apr/21

$$a^2+2ab+b^2-d^2-2cd-c^2$$$$={(a+b)}^2-{(c+d)}^2$$$$=(a+b+c+d)(a+b-c-d)$$

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