Companions of the inequalities of Fejér-Jackson and young
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Applications of some well-known theorems of Jackson and Young lead to the sharp inequalities, We prove that the following counterpart is valid for all integers n ≥ 1 and real numbers x ∈ (0, π): where the sign of equality holds if and only if n = 2 and x = π/2. © 2005 Akadémiai Kiadó, Budapest.