若sin(α-π/3),则cos﹙α+π/6﹚=
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若sin(α-π/3),则cos﹙α+π/6﹚=若sin(α-π/3),则cos﹙α+π/6﹚=若sin(α-π/3),则cos﹙α+π/6﹚=sin(α-π/3)=-sin(π/2-(π/6+α))
若sin(α-π/3),则cos﹙α+π/6﹚=
若sin(α-π/3),则cos﹙α+π/6﹚=
若sin(α-π/3),则cos﹙α+π/6﹚=
sin(α-π/3)=-sin(π/2-(π/6+α))=-cos(α+π/6)
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若sin(α-π/3),则cos﹙α+π/6﹚=
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