Which of the following are identities? I. tan z sin * COST Il. tan z cos z = gina Ill. cost = tan r sin a IV sing tang O I, II, and Ill O all are identities O I, II, and IV only O I, Ill, and IV Which of the following expressions is equivalent to Itsx OWhich of the following statements are true? I. cos 2x # 2 cost Il. cos 2x = cos(# + x) Ill. cos 20 = Cos 2 + Cos I IV. 2 coax = coax + cose O ll only O I only O Ill only O I, II, and IV only 1is equivalent to: O cos' z O sin' zThe trigonometric relation sin (# + x) + sin (] - x) is equivalent to: O v2 cos : O v2sina 2v/2 + cos : O 2 sin Given that sine = $, siny = _, and z and , are both acute angles, the value of tan(x + y) is O O O O Solve cos x = cos 2: on the domain 0