Which of the following are identities? sin x 1 - cos x 1 + cos x sin c Cos a - sin x 1 + sin x COs T cos 1 + sin x III. - sin x COST sin c 1 + cos x IV. - cos c sin c O I, III, and IV O I, II, and Ill O II only O all are identities Which of the following expressions is equivalent to (cos r +tan x) sin * O cota + sec x O cos x + cot x O tan x + sec x O sin x + tan r Which of the following statements are true? I. sec 2x = sec 2 sec x Il. sec 2x = sec(x + x) Ill. 2 sec x = sec x + sec x IV. sec 2x # 2 sec x O Ill only O I only O I, II, III only O II, III, and IV only 2 (1+cos 2: is equivalent to: O cos2 x O sin x O 1 - cos x O () - costThe trigonometric relation sin ( # + x ) + sin ( * - x ) is equivalent to: O V2 cos x O V2 sin x O 2v2 + cos x O 2 sin Given that sin x = , sin y = , and x and y are both acute angles, the value of tan(x - y) is O 39 O 117 O 14 O Solve 2 cot x sin x = sin x on the domain 0