(1)sin(-5π/12) (2)cos(-61π/12)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/14 23:54:56
(1)sin(-5π/12) (2)cos(-61π/12)
(1)sin(-5π/12)=-sin(5π/12)=-cosπ/12=-√[(cosπ/6+1)/2]=-√[(√3+2)/4]=-(√6+√2)/4 (2)cos(-61π/12)=cos(-5π-π/12)=-cos(-π/12)=-cosπ/12=-(√6+√2)/4
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来源:学生作业帮助网 编辑:作业帮 时间:2024/06/14 23:54:56
(1)sin(-5π/12) (2)cos(-61π/12)
(1)sin(-5π/12)=-sin(5π/12)=-cosπ/12=-√[(cosπ/6+1)/2]=-√[(√3+2)/4]=-(√6+√2)/4 (2)cos(-61π/12)=cos(-5π-π/12)=-cos(-π/12)=-cosπ/12=-(√6+√2)/4