[分析] 高微(6)

[PttFund (批踢踢基金只進不出)]

Suppose that f has the derivative which is monotonic decreasing with
f'(x) ≧ m > 0 on [a,b].  Show that

           b
        ∣∫ cos(f(x)) dx ∣ ≦2/m.
           a

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