已知函數(shù)f(x)=5sinxcosx-5√3cos^2x+[(5√3)/2] (x∈R)
已知函數(shù)f(x)=5sinxcosx-5√3cos^2x+[(5√3)/2] (x∈R)
(1)求f(x)的最大值、并求當(dāng)函數(shù)f(x)取最大值時自變量x的集合
(2)確定f(x)的單調(diào)遞增區(qū)間以及最小正周期.
(1)求f(x)的最大值、并求當(dāng)函數(shù)f(x)取最大值時自變量x的集合
(2)確定f(x)的單調(diào)遞增區(qū)間以及最小正周期.
數(shù)學(xué)人氣:778 ℃時間:2020-01-29 23:44:27
優(yōu)質(zhì)解答
f(x)=5sinxcosx-5√3 cos^2 x+5√3/2=5sin2x/2-5√3[(1+cos2x)/2]+5√3/2=5sin2x/2-5√3cos2x/2=5*sin(2x-п/3)所以函數(shù)的最小正周期為2п/2=п2kп-п/2≤2x-п/3≤2kп+п/22kп-п/6≤2x≤2kп+5п/6kп-п/12≤2...
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