一道三角函数题,若sin(x-y)cosy+cos(x-y)siny≥1,则x,y的取值范围分别是?（答案是x=2kπ+2分之π,k属于z,y属于R

一道三角函数题,若sin(x-y)cosy+cos(x-y)siny≥1,则x,y的取值范围分别是?（答案是x=2kπ+2分之π,k属于z,y属于R
一道三角函数题,
若sin(x-y)cosy+cos(x-y)siny≥1,则x,y的取值范围分别是?（答案是x=2kπ+2分之π,k属于z,y属于R

一道三角函数题,若sin(x-y)cosy+cos(x-y)siny≥1,则x,y的取值范围分别是?（答案是x=2kπ+2分之π,k属于z,y属于R
∵sin(x-y)cosy+cos(x-y)siny≥1
利用正弦公式,则
sin(x-y+y)≥1
及sinx≥1
∴sinx=1
∴x=2kπ+π/2, k ∈z
y ∈R

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