
sin4π/3=sin(π+π/3)
=-sin(π/3) (4π/3=π+π/3是第三象限角)
=-√3/2
sin(4π/3)=sin(π+π/3)= - sin(π/3)= - √3/2
希望对你有帮助~~
sin3分之4π=-sin3分之π=-2分之根号3
sin(π+π/3)=-=-sin(π/3) =-√3/2
sin3分之4π
=-sin1/3π
=-√3/2

sin4π/3=sin(π+π/3)
=-sin(π/3) (4π/3=π+π/3是第三象限角)
=-√3/2
sin(4π/3)=sin(π+π/3)= - sin(π/3)= - √3/2
希望对你有帮助~~
sin3分之4π=-sin3分之π=-2分之根号3
sin(π+π/3)=-=-sin(π/3) =-√3/2
sin3分之4π
=-sin1/3π
=-√3/2