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3x+π/4=π/2時,即x=π/12時取最大值為1 3x+π/4=0時,即x= -π/12時取最小值為-1 最大值:1,當(3x+π/4)=π/2時,即x=π/12時,取到最大值. 最小值:-3,當(3x+π/4)=3π/2時,即x=5π/12時,取到最小值
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