39. Identify the best first step in a verification of the following identity. cot reece = csco D a. coteseca = vese?-1 v tan +1 D b. cot a sect = I 1 tank cos sing cosa D d. cot a seca = COS E sinc Topic covered in 6.2 W Report.a problem 40. Identify the first step that can NOT be used in a verification of the following i dentity. (tan u + sec u) 1 + sin u 1 - sin m D a. (tanu + secu)' = tanu + 2 tan usecu + see u D b. (tan u + secu) = sin u cos IF D C (tana + secu) = tan' u + sect u D d. All of these choices are valid first steps. Topic covered in 8.2 P Report. a problem 41. Identify the best first step in a verification of the following identity. cos # + tan O sin 0 = sec # D a. cose + tan elaine = -+ tane . - esc A D b. cos# + tand sind = cost + 1 cot sing D & cos + tan Using = cose + sing cos 6 Sin 9 D d. cos # + tan sin# = v1 - sin' # + vsec39 - 1v1 - cos'9 Topic covered in 8.2 w Report. a problem 42. Identify the best first step in a verification of the following i dentity. see 8 - cos 8 = sin Stan 8 D a. see A - cos = cos B COS B cos 8 D b. see A - cos B = sec 8 - - 1 see 8 D C. see B - cos / = ese (7 - 8) - sin (7-8) D d. see A - cong sep - cos see 8 + cos B 1 sec 8 + cos B