(4/3)*cos²(13π/6)+3tan²(π/6)-(1/3)*sin²(2π/3)=(4/3)*cos²(π/6)+3tan²(π/6)-(1/3)*sin²(π/3)=(4/3)*(√3/2)²+3*(√3/3)²-(1/3)*(√3/2)²=(4/3)*(3/4)+3*(1/3)...