Given any triangle abc with corresponding side lengths a, b,c the law of cosines states: ? can someone explain to me how i get this

Which lines spoken by romeo in act iii, scene i of romeo and juliet best support the inference that romeo desires future peace between the montagues and capulets? check all that apply. abc romeo: tybalt, the reason that i have to love thee doth much excuse the appertaining rage to such a greeting; villain am i none, romeo: i do protest i never injur'd thee, but love thee better than thou canst devise, romeo: draw, benvolio; beat down their weapons, gentlemen, for shame, forbear this outrage! romeo: alive! in triumph! and mercutio slain! away to heaven, respective lenity, and fire-ey'd fury be my conduct now! romeo: this day's black fate on more days doth depend; this but begins the woe others must end.