sin(-20π\3)等于

sin(-20π\3)等于
sin(-20π\3)等于

sin(-20π\3)等于
sin(-20π\3)=sin[(-18-2)π\3]
=sin(-2π\3)
=-sin(2π\3)
=-√3/2

这个sin(-20派/3)=sin(-20派/3 8派)=sin(4派/3)=sin(派 派/3)=负的二分之根三

SIN(6派-20/3派)=SIN(-2/3派)=-SIN(派-2/3派)=-SIN(3/派)=-2/根号3