Объяснение:
6*sin40°*sin50°/cos10°=6*sin50°*sin40°/cos10°=
=6*(1/2)*((cos(50°-40°)-cos(50°+cos40°))/cos10°=
=3*(cos10°-cos90°)/cos10°=3*(cos10°-0)/cos10°=3*cos10°/cos10°=3.
Объяснение:
6*sin40°*sin50°/cos10°=6*sin50°*sin40°/cos10°=
=6*(1/2)*((cos(50°-40°)-cos(50°+cos40°))/cos10°=
=3*(cos10°-cos90°)/cos10°=3*(cos10°-0)/cos10°=3*cos10°/cos10°=3.