I need help solving all these problems. I would be eternally grateful.

Review & Preview 6-26. When James solved cos x = 1 , he got x = cos (2 ). His calculator told him that x = 1.047. Verify that this corresponds to the exact solution . a. We also know S" is a solution to x = cos ! ( 2 ), but the calculator doesn't give that answer. Why? b. Write the complete solution to cos x = ?. C. Can you get the complete solution entirely from your calculator, or do you have to draw and think? 6-27. Find as many answers as you can where tan x = 0. 6-28. Sylvie needs to solve cos x = -0.3 on a math test. She knows that cost is the inverse function for cosine, so she applies this function to both sides of the equation. This gives her x = cos (-0.3) = 1.875. But when her test is returned, she finds she earned only partial credit on the problem. a. What is wrong with Sylvie's method? b . What should Sylvie have answered to receive full credit? Explain your answer. 6-29. Evaluate each expression for 0 (in radians) and leave your answers in fraction form when appropriate. Remember the restricted ranges for the functions. a. 0 = sin-1 (- 3 b. 0 = arcsin (12 C . 0 = arccos d. 0 = cos-1/13 6-30. If sin 0 = = and $ 30 S m , find cos 0. You will need a unit circle diagram or a sketch of the graph of y = sin x , in addition to the Fundamental Pythagorean Identity, to help you answer this. 276 Pre-Calculus with Trigonometry