cos(3分之20π)等于?
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cos三分之二十π的三角函数值:-1/2
cos20π/3
=cos(18π/3+2π/3)
=cos(6π+2π/3)
=cos(2π/3)
=cos(π-π/3)
=-cosπ/3
=-1/2
咨询记录 · 回答于2021-11-24
cos(3分之20π)等于?
cos三分之二十π的三角函数值:-1/2
cos20π/3
=cos(18π/3+2π/3)
=cos(6π+2π/3)
=cos(2π/3)
=cos(π-π/3)
=-cosπ/3
=-1/2
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