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Prove that Delta=|(1,bc+ad,b^(2)c^(2)+a^...

Prove that `Delta=|(1,bc+ad,b^(2)c^(2)+a^(2)d^(2)),(1,ca+bd,c^(2)a^(2)+b^(2)d^(2)),(1,ab+cd,a^(2)b^(2)+c^(2)d^(2))|=(a-b)(a-c)`
`(a-d)(b-c)(b-d)(c-d)`.

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