Alg3.4.13

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\displaystyle a^2 b^2+c^2 d^2-a^2 c^2-b^2 d^2 = a^2(b^2 - c^2) + d^2(c^2 - b^2) = (b^2-c^2)(a^2 -d^2)= \displaystyle (b-c)(b+c)(a-d)(a+d)

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