已知函數(shù)f(x)=4cosxsin(x+π6)?1 (Ⅰ)求f(x)的最小正周期; (Ⅱ)求f(x)在區(qū)間[?π6,π4]上的最大值和最小值.
已知函數(shù)f(x)=4cosxsin(x+
)?1
(Ⅰ)求f(x)的最小正周期;
(Ⅱ)求f(x)在區(qū)間[?
,
]上的最大值和最小值.
π |
6 |
(Ⅰ)求f(x)的最小正周期;
(Ⅱ)求f(x)在區(qū)間[?
π |
6 |
π |
4 |
數(shù)學人氣:990 ℃時間:2019-10-19 13:47:06
優(yōu)質(zhì)解答
(Ⅰ)∵f(x)=4cosxsin(x+π6)-1=4cosx(32sinx+12cosx)-1=3sin2x+cos2x=2sin(2x+π6),∴f(x)的最小正周期T=2π2=π;(Ⅱ)∵x∈[-π6,π4],∴2x+π6∈[-π6,2π3],∴-12≤sin(2x+π6)≤1,-1≤2si...
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