函数y=cos(x+π/6）,x属于【0,π/2】的值域是

函数y=cos(x+π/6）,x属于【0,π/2】的值域是
函数y=cos(x+π/6）,x属于【0,π/2】的值域是

函数y=cos(x+π/6）,x属于【0,π/2】的值域是
for x = π/2
y = cos(π/2+π/6)
= cos(2π/3)
= -1/2
x属于【0,π/2】的值域是
[-1/2,1]