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X2 p. 2cos(3/2п +x)=. Cos(3п/2-x). 2cos(3x-п/3)-1=0. Cos(3p/2 - 2x).
2cos(3/2п +x)=. Cos(3п/2-x). 2cos(3x-п/3)-1=0. Cos(3p/2 - 2x).