函数f(x)=sqrt{3}cosx-sinx(0≤x≤π/6)的值域是
问题描述:
函数f(x)=sqrt{3}cosx-sinx(0≤x≤π/6)的值域是
答
f(x)=sqrt{3}cosx-sinx(
=2(√3/2*cosx-1/2sin2x)
=2cos(x+π/6)
∵0≤x≤π/6
∴π/6≤x+π/6≤π/3
∴1/2≤cos(x+π/6)≤√3/2
∴1≤f(x)≤√3
∴f(x)的值域为[1,√3]