2 cos x+cosx-1=0 Algebraically determine the value of x, where 540 x 720, for the following equation. Use the following information to answer the next question. The following trigonometric identity is given. sin x 1+cosx 4. Using the above identity, answer the following questions. (5 marks total) a. Verify this identity is true for x = C. +cot x = CSC X Prove the identity. b. State the restrictions for the identity in general form.