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Based on a trigonometric function, an effective entropy measure for intuitionistic fuzzy sets is proposed. The entropy measure reflects not only the difference between the membership degree and the nonmembership degree, but also the hesitancy degree. Then two intuitionistic fuzzy entropy formulas proposed by former references are discussed and compared with the proposed formula. Numerical examples are given to show that the proposed entropy measure can measure the fuzziness and intuitionism of intuitionistic fuzzy sets.