计算:sin(π/12)sin(5π/12)
计算:sinπ12
计算cosπ/12*sinπ/12
已知sin(π+α)=-12,计算:
已知sin(π+α)=−12,计算:
已知阿尔法,贝塔属于(3π/4,π),sin(阿尔法+贝塔)=-3/5,sin(贝塔-π/4)=12/13,则sin(阿
cos*π/12—sin*π/12
cos5π/12=sinπ/12
求值:sin(π/12)+cos(π/12)
三角函数诱导公式已知sin(π+α)= -1/2,计算1.sin(5π-α)2.sin(π/2+α)3.cos(α- 3
sin²α+√3sinαcosα-2cos²α=0,α∈(π/6,5π/12),求:(1)sin(2
已知sin a=2cos a 计算⑴(sinα+2cosα)/(5cosα-sinα) ⑵tan(α+π/4)
如果sin(π+A)=12