已知向量a=(1/2,cosx) b=(sinx,-√3/2)则函数f(x)=ab的单调递增区间为?
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![已知向量a=(1/2,cosx) b=(sinx,-√3/2)则函数f(x)=ab的单调递增区间为?](/uploads/image/z/616360-40-0.jpg?t=%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%281%2F2%2Ccosx%29+b%3D%28sinx%2C-%E2%88%9A3%2F2%29%E5%88%99%E5%87%BD%E6%95%B0f%28x%29%3Dab%E7%9A%84%E5%8D%95%E8%B0%83%E9%80%92%E5%A2%9E%E5%8C%BA%E9%97%B4%E4%B8%BA%3F)
已知向量a=(1/2,cosx) b=(sinx,-√3/2)则函数f(x)=ab的单调递增区间为?
已知向量a=(1/2,cosx) b=(sinx,-√3/2)则函数f(x)=ab的单调递增区间为?
已知向量a=(1/2,cosx) b=(sinx,-√3/2)则函数f(x)=ab的单调递增区间为?
f(x)=ab=sinx/2-√3/2cosx
=sin(x-pi/6)
单调增区间x-pi/6属于[2kpi-pi/2,2kpi+pi/2]
x属于[2kpi-pi/3,2kpi+2pi/3]