f(x)=4cosxsin(x+π/6)-1
=4cosx(√3/2sinx+1/2cosx)-1
=2√3sinx+2cos^2x-1
=√3sin2x+cos2x
= 2sin(2x+π/6)
x∈[-π/6,π/4],則(2x+π/6)∈[-π/6,2π/3]
畫個單位圓,一比劃就出來了
所以f(x)最大值為2,最小值為-1
已知函數(shù)f(x)=4cosxsin(x+π/6)-1,求f(x)在區(qū)間[-π/6,π/4]上的最大值和最小值
已知函數(shù)f(x)=4cosxsin(x+π/6)-1,求f(x)在區(qū)間[-π/6,π/4]上的最大值和最小值
數(shù)學(xué)人氣:593 ℃時間:2019-12-25 02:55:56
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