cos-3π,tansincos的数值表

cosπ/4=?
求值:cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11)
求值:cos(π/11)cos(2π/11)cos(3π/11)cos(4π/11)cos(5π/11)
cos(3π/2)等于多少
已知cos(απ/4)=√3/3,则sin2α的值