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ASU 484 All Soviet Union MO 1988 sinx_1+2sin x_2+ ...+nsinx_n=100

Source:

August 8, 2019
trigonometrysystem of equationsminimumalgebraSum

Problem Statement

What is the smallest nn for which there is a solution to {sinx1+sinx2+...+sinxn=0sinx1+2sinx2+...+nsinxn=100\begin{cases} \sin x_1 + \sin x_2 + ... + \sin x_n = 0 \\ \sin x_1 + 2 \sin x_2 + ... + n \sin x_n = 100 \end{cases} ?