2除3π小于等于x+

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2除3π小于等于x+2除3π小于等于x+2除3π小于等于x+已知:2π/3≤x+π/3≤4π/3,即:x+π/3∈[2π/3,4π/3]从余弦函数图像上可以看出:当x+π/3=π/2时,cos(x+π

2除3π小于等于x+
2除3π小于等于x+

2除3π小于等于x+
已知:2π/3≤x+π/3≤4π/3,即:x+π/3∈[2π/3,4π/3]
从余弦函数图像上可以看出:
当x+π/3= π/2时,cos(x+π/3)最小=-1
当x+π/3=2π/3,或x+π/3=4π/3时,cos(x+π/3)最大=-1/2
所以:-1≤cos (x+π/3)≤-1/2