C-03-Q041mediumsingle_mcq△ABC\triangle ABC△ABC এ ∠B=120°\angle B = 120°∠B=120° হলে AC2AC^2AC2 এর মান—aAB2+BC2−AB⋅BCAB^2 + BC^2 - AB \cdot BCAB2+BC2−AB⋅BCbAB2+BC2+AB⋅BCAB^2 + BC^2 + AB \cdot BCAB2+BC2+AB⋅BCcAB2+BC2AB^2 + BC^2AB2+BC2dAB2−BC2AB^2 - BC^2AB2−BC2