y=sinx -(根号3倍的cosx)的值域

问题描述:

y=sinx -(根号3倍的cosx)的值域

y=2(sinx*1/2-cosx*√3/2)
=2(sinxcosπ/3+cosxsinπ/3)
=2sin(x-π/3)
值域[-2,2]2(sinxcosπ/3+cosxsinπ/3)中间是减吧?哦,对,打错了