学帮网cosπ/8·cos3π/8计算过程
来源：学生作业学帮网 编辑：学帮网 时间：2024/05/30 04:14:50
cosπ/8·cos3π/8计算过程
cos(π/8)×cos(3π/8)
=cos[(π/2)－(3π/8)]×cos(3π/8)
=sin(3π/8)cos(3π/8)
=(1/2)[2sin(3π/8)cos(3π/8(]
=(1/2)sin(3π/4)
=√2/4
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来源：学生作业学帮网 编辑：学帮网 时间：2024/05/30 04:14:50
cosπ/8·cos3π/8计算过程
cos(π/8)×cos(3π/8)
=cos[(π/2)－(3π/8)]×cos(3π/8)
=sin(3π/8)cos(3π/8)
=(1/2)[2sin(3π/8)cos(3π/8(]
=(1/2)sin(3π/4)
=√2/4