已知cos(π/6-α)=m(|m|≤1),求cos(5π/6+α),sin(2π/3-α)的值

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已知cos(π/6-α)=m(|m|≤1),求cos(5π/6+α),sin(2π/3-α)的值已知cos(π/6-α)=m(|m|≤1),求cos(5π/6+α),sin(2π/3-α)的值已知co

已知cos(π/6-α)=m(|m|≤1),求cos(5π/6+α),sin(2π/3-α)的值
已知cos(π/6-α)=m(|m|≤1),求cos(5π/6+α),sin(2π/3-α)的值

已知cos(π/6-α)=m(|m|≤1),求cos(5π/6+α),sin(2π/3-α)的值
∵cos(π/6-α)=m(|m|≤1),
∴cos(5π/6+α)
=cos[π-(π/6-α)]
=-cos(π/6-α)
=-m
sin(2π/3-α)
=sin[π/2+(π/6-α)]
=cos(π/6-α)
=m

—m和m