函数y=cos3x+sin2x-cosx的最大值等于 _ .
函数y=cos3x+sin2x-cosx的最大值等于 ___ .
数学人气:602 ℃时间:2020-06-07 17:10:51
优质解答
∵y=cos3x+sin2x-cosx=cos3x-cos2x-cosx+1=cos2x(cosx-1)+(1-cosx)=(1-cosx)(1-cos2x)=(1-cosx)(1-cosx)(1+cosx)=12(1-cosx)(1-cosx)(2+2cosx),∵1-cosx≥0,2+2cosx≥0,∴(1-cosx)(1-cosx...
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