These are all separate problems but I really need help on all of them. Please help me

Review the Preview circle. Find the exact value of each of the following without using a calculator or your un 4137. COS b . tan 31x a. Find all values of & where 0 50 - 27 , such that the following equations are true. 138. Use exact values for 0. cos 0 = 1 b. a. tan 0 = -1 c. csc 0 = 2 d. sec 0 = V2 Verify the following trigonometric identities. Intermediate steps may involve complex 39. fractions. csc x - sin x = cot x cos x b. sec x + tan x = a. sec x-tan x