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Omni-MATH / Suppose that a,b,c,d are positive real numbers satisfying (a+c)(b+d)=ac+bd. Find the smallest possible value of (a)/(b)+(b)/(c)+(c)/(d)+(d)/(a). [i]Israel[/i] · Discussion

Discussing Suppose that a,b,c,d are positive real numbers satisfying (a+c)(b+d)=ac+bd. Find the smallest possible value of (a)/(b)+(b)/(c)+(c)/(d)+(d)/(a). [i]Israel[/i] · Omni-MATH

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