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36. Determine the exact values for each of the following. Use the special angles and the related acute angles to help you. (6 marks: 1 mark each) a) sin450 b) cos60 c) tan315" d) cscl20" e) sec135" f) cot(-240") 37. Simplify each trigonometric expression: (6 marks: 3 marks each) sin x a) b) cscotan 0seco tan x cos x 38. Prove each identity: a) sinx + tanx = tanx(cosx +1) (3 marks) b) tand-1 = - sin 0 - cos' e sin OcosA + cos' 0 (5 marks) c) sinx + sinxcot x = csex