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判斷題

cos-60°、cos60°、cos120°、cos240°的函數(shù)值都是0.5

答案：錯誤

你可能感興趣的試題

sin-30°和sin210°的函數(shù)值都是-0.5

答案：正確

值域為[-π/2，π/2]時，arctan1的函數(shù)值為90

答案：錯誤