cos乘以3分之16派怎么算啊

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cos乘以3分之16派怎么算啊cos乘以3分之16派怎么算啊cos乘以3分之16派怎么算啊cos(16π/3)=cos(π/3+5π)=cos(π/3+π)=-cosπ/3=-1/2

cos乘以3分之16派怎么算啊
cos乘以3分之16派怎么算啊

cos乘以3分之16派怎么算啊
cos(16π/3)
=cos(π/3+5π)
=cos(π/3+π)
=-cosπ/3
=-1/2