化简cos(60°+α)=
问题描述：
化简cos(60°+α)=
答
=cos60cosa-sin60sina=1/2cosa-(2/根号3）sina
答
cos(60°+α)
=cos60°cosα-sin60°sinα
=cosa/2-√3sinα/2
=(cosα-√3sinα)/2
答
化简cos(60°+α)
=cos60°cosα-sin60°sinα
=cosα/2-√3sinα/2;
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