[2sin50°+sin80°(1+√3tan10°)]/cos5° =[2sin50°+cos10°(cos10°+√3sin10°)/cos10°]/cos5° =[2sin50°+2(1/2*cos10°+√3/2*sin10°)]/cos5°=[2sin50°+2(cos60°*cos10°+sin60°*sin10°)]/cos5°=[2si...