a = m + 2n = (1, 0) + 2(1/2, √3/2) = (2, √3)b = 2m - 3n = 2(1, 0) - 3(1/2, √3/2) = (1/2, -3√3/2)cos = (a • b)/(∣a∣∣b∣)= [2*(1/2) + √3*(-3√3/2)] /{ [√(2²...