Объяснение:
6*sin²(2π/3)-2*cosπ-tg²(π/6)=6*(√3/2)²*-2*(-1)-(√3/3)²=
=6*3*/4+2-1/3=18/4+1²/₃=(18/4)+(5/3)=(18*3+5*4)/12=(54+20)/12=74/12=6¹/₆.
