求下列函数的值域 (1)y=3sin(2x+π/2)-1 (x∈[-π/4,π/3]) (2)y=(cosx)^2-3cosx+1 (3)y=(cosx)^2-2cosx+1求下列函数的值域 (1)y=3sin(2x+π/2)-1 (x∈[-π/4,π/3])(2)y=(cosx)^2-3cosx+1 (3)y=(cosx)^2-2cosx+1 (x∈[-π/4,π/3])

问题描述:

求下列函数的值域 (1)y=3sin(2x+π/2)-1 (x∈[-π/4,π/3]) (2)y=(cosx)^2-3cosx+1 (3)y=(cosx)^2-2cosx+1
求下列函数的值域 (1)y=3sin(2x+π/2)-1 (x∈[-π/4,π/3])
(2)y=(cosx)^2-3cosx+1 (3)y=(cosx)^2-2cosx+1 (x∈[-π/4,π/3])

1.y=-3cos2x-1
-pai/2