cosα+根号3/3sinα怎么化成2根号3/3sinα(60°+α)
问题描述:
cosα+根号3/3sinα怎么化成2根号3/3sinα(60°+α)
答
cosα+√3/3sinα
=√3/3(√3cosα+sinα)
=2√3/3(√3/2*cosα+1/2*sinα)
=2√3/3(sin60°cosα+cos60°sinα)
=2√3/3*sin(60°+α)
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