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C 1 cos. Cos2x+3cosx-1 0 -4п -5п/2. Cos 5п2-x -2cos2x. Cos2x-3sin -x -2 0 3п 9п/2. Sinx 0.5 решение.
Cos2x+3cosx-1 0 -4п -5п/2. Cos 5п2-x -2cos2x. Cos2x-3sin -x -2 0 3п 9п/2. Sinx 0.5 решение.

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