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The relationship between a square number and four alphabets

Prove that for any ordered set of real numbers \(a,b,c,d\), where \(a+b=c+d=2\), \[(a^2+c^2)(b^2+d^2)(a^2+d^2)(b^2+c^2)\leq 25\]

Gah it was wrong changing it now.

Note by Joshua Ong
3 years ago

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