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cos(α-∏/6)+sinα=4√3/5展開可得1/2cosα+√3/2sinα=4/5 再利用輔助角公式得sin(α+π/6)=4/5 sin(α-7∏/6)=cos(α+π/6) 再根據同角平方關係知sin(α-7∏/6)=3/5或-3/5
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