4,5
Объяснение:
sin420°=sin(420°-360°)=sin60°=√3/2
tg(34π/6)=tg(6π-2π/3)=
=-tg2π/3=-(-√3)=√3
cos(17π/3)=cos(6π-π/3)=cos(π/3)=1/2
ctg(-315°)=-ctg(360-45°)=ctg45°=1
6×(√3/2)×√3×(1/2)×1=9/2=4,5
вуаля :)
