化简[sin(α+π/ 6)-sin( α-π÷6)]÷cosa
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化简[sin(α+π/ 6)-sin( α-π÷6)]÷cosa
化简[sin(α+π/ 6)-sin( α-π÷6)]÷cosa
化简[sin(α+π/ 6)-sin( α-π÷6)]÷cosa
不懂的话,一步一步化简,加油!