化简 1/2sina+根号3/2cosa 根号2/2sina-根号2/2cosa
人气：459 ℃ 时间：2019-10-17 07:53:30
解答
1/2sina+根号3/2cosa
=sina*cosπ/3+sinπ/3cosa
=sin（a+π/3）
根号2/2sina-根号2/2cosa
=sinacosπ/4-sinπ/4cosa
=sin（a-π/4）
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