35. Identify the best first step in a verification of the following identity. COS - = 1 + sin u 1 - sin 1 Da. COSM I - sin a sin u 1 + sin 1 - sin a 1 - sinu 1+ sinn COS 1 - sin m COS I D d. cos' 1 sin u - 1 1 - sin a 1 - sin M 36. Identify the first step that can NOT be used in a verification of the following i dentity. 1 + tan x = esc' x tan's D a, +tan's 1+ (1 + seek a) tan z 1 + secr D b. I + tan' z tan' z tan' alt tan' a tan' a tan' z tan I D d. I+ tan's tan z Ink covered in 8.2 ) Report, a problem. 37. Identify the best first step in a verification of the following identity. 1 - 2sin x = 2cos x - 1 D al-2sin z = 1 - 2(cos] x - 1) D b. 1 - 2sin z = 1-2(1 - cos] z) D 61-2sin'x= 1 -2 - sin' z D d. 1 - 2xin3 x = (1 + 2sina) (1 - v2sinz) 38. Identify the best first step in a verification of the following i dentity. sin (-0) sec (-0) = - tand D a. sin (-#) sec (-8) = (-sin#) (-sec#) D b. sin (-#) sec (-#) = (sin #) (-sec#) D . sin (-0) see (-8) = (-sin#) (see#) D d. sin (-8) sec (-#) = (sin #) (see#)