Let , and be positive real. Find the minimum value of:
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Let's assume a + b + c = 3 . The given expression reduces to c y c ∑ 5 − a a 5 + a 3 + 1 4 let f ( x ) = 5 − x x 5 + x 3 + 1 4 . Since f ( x ) is a convex function, by Jensen's Inequality, we have f ( 3 a + b + c ) ≤ 3 f ( a ) + f ( b ) + f ( c ) so, we have f ( a ) + f ( b ) + f ( c ) ≥ 1 2 . And hence the minimum value is 1 2