I really need help on these problems. I would be very grateful.

Preview 6- 72 Sketch the graph of y = 3 sin ( [ (x -2)) +1. a. sin o Use the diagram at right to find exact values of the following trig expressions. b. COs O C. tan a 6-74. Christina stared at the equation tan x = . 7 . "That's interesting," she thought. "Since tan x = six , this must mean that sin x = 3 and cos x = 7. But that's impossible." a. Why is it impossible? b. What's going on here? c. Find x if OSX S2n . -75. Solve the following equations. a. x2 - 4x = 21 b. (x - 2) (x+ 1) = 4 C. 3+1 =10 $ 2 d. V6x2+5x = 5 tan x . CSC X 6-76. Simplify: sec x 6-77. Find the equation of all possible lines that pass through the point (285, 912) and make an angle of 28 with the x-axis. Hint: No arithmetic is required, but you do need your calculator. 6-78. Prove that sec x . tan x = sec- x. sin x 289 Chapter 6: Extending Perio