UNIT 5: TRIGONOMETRY II Sketching/Written Assignment Lesson 3: Proving Trigonometric Functions . tanx-1 . ) 1. Use this statement, R = SInX COSX , to answer the following: ; : T i a) Verify the statement is true for x = 3 b) Use a graphing calculator to show that (2 marks) the statement is probably an identity. LS. RS. (1 mark) ) Prove the statement is an identity using d) State the restrictions in terms of x. an algebraic approach. (3 marks) (1 mark) L., R.S. 2. Algebraically prove whether or not this statement is true: (3 marks) 2sin?x 1 = sin?x cos?x