2. Find the exact values of the following under the given conditions. Show all your steps clearly: a. Sin(a+B). b. cos(a+B). C. tan(a+B) cosa=1/2 and a lies in quadrant IV, and sinB = -1/3 and B lies in quadrant III. 3. Solve these equations using whatever methods is most appropriate. Explain in words what method you used: a. cosx - 5= 3cosx + 6 b. 7cosx = 4-2sin2x