已知cos(α+π⼀6)=-1⼀3,则sin(α-π⼀3)

2024-11-01 05:41:02
有2个网友回答
网友(1):

你好

cos(α+π/6)=sin[π/2-(α+π/6)]=sin(π/3-α)=-sin(α-π/3)
所以sin(α-π/3)=-cos(α+π/6)=1/3

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网友(2):

sin(π/2+α)= cosα
cos(π/2+α)= -sinα

cos(α+π/6)=-1/3
cos(α+π/2-π/3)=-1/3
cos(π/2+α-π/3)=-1/3
cos(π/2+α-π/3)=-1/3
-sin(α-π/3)=-1/3
sin(α-π/3)=1/3