sinx+tan60cosx=2sin(x+60)怎么得出来的啊?
陈小青回答:
左边=sinx+√3cosx
=2(1/2*sinx+√3/2*cosx)
=2(sinxcos60+cosxsin60)
=2sin(x+60)=右边
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sinx+tan60cosx=2sin(x+60)怎么得出来的啊?
陈小青回答:
左边=sinx+√3cosx
=2(1/2*sinx+√3/2*cosx)
=2(sinxcos60+cosxsin60)
=2sin(x+60)=右边