已知0<α<π,sin(α+π/4)=12/13,求sina/cos(π/4-α)的值
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已知0<α<π,sin(α+π/4)=12/13,求sina/cos(π/4-α)的值
已知0<α<π,sin(α+π/4)=12/13,求sina/cos(π/4-α)的值
已知0<α<π,sin(α+π/4)=12/13,求sina/cos(π/4-α)的值