Question

45.  
What values for  (0 ≤  ≤ 2π) satisfy the equation 2cos + = –cos ?  (1 point)
0 and 3.14
0.5 and 5.78
1.23 and 5.05
1.91 and 4.37
43 A beam rests against a wall, forming a 55° angle with the floor. Use the function y = 9sec to find the length of the beam to the nearest tenth of a foot.  (1 point)
10.0 ft
11.0 ft
15.7 ft
17.4 ft