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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
2 years, 5 months ago