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Post to report: 6 + 2 sen x = 1 6 + 2 sen x = 1 6 + 2 sen x = 1 2 cos 2 x + 5 sen x = – 1 2 cos2x + 5 sen x = –1 2 cos 2 x – cos x = 0 2 cos 2 x – cos x = 0 2 cos2x –