и функции sin и cos периодические с периодом 2π
поэтому
cos(74π/3)=cos(24π+2π/3)= cos(2π/3)=-1/2
sin(74π/3)=sin(24π+2π/3)= sin(2π/3)=√3/2
и функции sin и cos периодические с периодом 2π
поэтому
cos(74π/3)=cos(24π+2π/3)= cos(2π/3)=-1/2
sin(74π/3)=sin(24π+2π/3)= sin(2π/3)=√3/2