高一数学求解 求过程!
2个回答
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f(x)=2cosxsin(x+π/3)+√3cos²x+sinxcosx-√3=cosx(sinx+√3cosx+√3cosx+sinx)-√3=sin2x+2√3cos²x-√3=sin2x+√3(1+cos2x)-√3=sin2x+√3cos2x=2sin(2x+π/3);
(Ⅰ)f(x)=2sin(2x+π/3),周期=π,当sin(2x+π/3)=1有最大值,x=π/12,sin(2x+π/3)=-1有最小值,x=7π/12,f(x)=2sin(2x+π/3)在0≤x≤π/12上为增函数,在π/12<x≤7π/12上为减函数,当x∈[0,π/2]时,x=π/2时有最小值-√3,值域[-√3,2]
(Ⅱ)x=-π/6时f(x)=0,x=π/12时f(x)=2,x=π/3时f(x)=0,x=7π/12时f(x)=-2,x=5π/6时f(x)=0;
(Ⅲ)由y=sinx图像,上下振幅增加一倍,左右周期减小一倍,频率增加一倍,并左移π/6。
(Ⅰ)f(x)=2sin(2x+π/3),周期=π,当sin(2x+π/3)=1有最大值,x=π/12,sin(2x+π/3)=-1有最小值,x=7π/12,f(x)=2sin(2x+π/3)在0≤x≤π/12上为增函数,在π/12<x≤7π/12上为减函数,当x∈[0,π/2]时,x=π/2时有最小值-√3,值域[-√3,2]
(Ⅱ)x=-π/6时f(x)=0,x=π/12时f(x)=2,x=π/3时f(x)=0,x=7π/12时f(x)=-2,x=5π/6时f(x)=0;
(Ⅲ)由y=sinx图像,上下振幅增加一倍,左右周期减小一倍,频率增加一倍,并左移π/6。
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