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Omni-MATH / Determine the greatest possible value of ∑_(i=1)¹⁰cos(3x_(i)) for real numbers x₁,x₂,…,x₁₀ satisfying ∑_(i=1)¹⁰cos(x_(i))=0.

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problem

Determine the greatest possible value of ∑i=110cos(3xi)\sum_{i=1}^{10} \cos(3x_i) for real numbers x1,x2,…,x10x_1,x_2,\dots,x_{10} satisfying ∑i=110cos(xi)=0\sum_{i=1}^{10} \cos(x_i) = 0.
Plain-text mathematical notation (without MathML)
Determine the greatest possible value of ∑_(i=1)¹⁰cos(3x_(i)) for real numbers x₁,x₂,…,x₁₀ satisfying ∑_(i=1)¹⁰cos(x_(i))=0.
Original LaTeX notation
Determine the greatest possible value of \(\sum_{i=1}^{10} \cos(3x_i)\) for real numbers $x_1,x_2,\dots,x_{10}$ satisfying \(\sum_{i=1}^{10} \cos(x_i) = 0\).

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