✨ 最佳解答 ✨
f(x) = (1 - cos^2) + cos + 3 = -cos^2 + cos + 4 = -(cos - 1/2)^2 + 17/4 且 1/sqrt2 ≧ cos& 1/2 ≧ 0
得 M = 17/4, m = 4; M + m = 33/4
✨ 最佳解答 ✨
f(x) = (1 - cos^2) + cos + 3 = -cos^2 + cos + 4 = -(cos - 1/2)^2 + 17/4 且 1/sqrt2 ≧ cos& 1/2 ≧ 0
得 M = 17/4, m = 4; M + m = 33/4
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