Объяснение:
√3/2 * 1/2 * 1 * (-√3/3) = -1/4
sin(2π/3)*cos(π/3)*tg(π/4)*ctg(2π/3)=
sin(π/3)*cos(π/3)*tg(π/4)*(-ctg(π/3))=
- (√3/2) * (1/2) * 1 * (√3/3)= -(√3*1*√3)/(2*2*3)=-1/4.
Объяснение:
√3/2 * 1/2 * 1 * (-√3/3) = -1/4
sin(2π/3)*cos(π/3)*tg(π/4)*ctg(2π/3)=
sin(π/3)*cos(π/3)*tg(π/4)*(-ctg(π/3))=
- (√3/2) * (1/2) * 1 * (√3/3)= -(√3*1*√3)/(2*2*3)=-1/4.