函数y=根号3sinx+cosx,x∈ [-6分之π,6分之π]的值域是

题目

函数y=根号3sinx+cosx,x∈ [-6分之π,6分之π]的值域是
y=2(√3/2sinx+1/2cosx)
=2(sinxcosπ/6+cosxsinπ/6)
=2sin(x+π/6)
-π/2

答案

y=2(√3/2sinx+1/2cosx)
=2(sinxcosπ/6+cosxsinπ/6)
=2sin(x+π/6)
-π/6