设函数f(x)=sin(wx+2π/3)+sin(wx-2π/3)(w>0)的最小正周期为π,求函数的单调区间?
设函数f(x)=sin(wx+2π/3)+sin(wx-2π/3)(w>0)的最小正周期为π,求函数的单调区间?
数学人气:993 ℃时间:2019-08-19 06:56:17
优质解答
f(x)=sin(wx+2π/3)+sin(wx-2π/3)=sinwxcos(2π/3)+coswxsin(2π/3)+sinwxcos(2π/3)-coswxsin(2π/3)=sinwxcos(2π/3)+sinwxcos(2π/3)=2sinwxcos(2π/3)=-sinwx∵T=π∴2π/w=πw=2∴函数为f(x)=-sin2x∴函数的单...
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