- π ≤ x ≤ 0﹐f (x) = cos2x + 4sin2x - cosx - 2﹐. (1)若f (x)之最大值為M﹐最小值為m﹐. 求數對(M,m) = ______﹒ (2)方程式cos2x + 4sin2x - cosx - 2 = 0 之解為.
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