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函數y=1-三分之二sinx取最大值時,sinx要最小,即sinx=0,則x=0180或360 最大值=1-0=1 函數y=1-三分之二sinx取最小值時,sinx要最大,即sinx=1,則x=90 最小值=1-2/3=1/3
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