Rewrite the expression as an equivalent expression that does not contain powers of trigonometric functions greater than 1.
cos
Х
O A. 3 + 2 cos 2x + cos 4x/
8
B. 3+4 cos 2x + cos 4x/
8
C. 2-4 cos 2x + cos 4x/
8
D.
3-4 cos 2x + cos 4x/
8

Grace is standing 18 feet from a lighthouse and kelly is standing 10 feet from grace. the angle that grace looks up to see the top of the lighthouse is 45°. the angle that kelly looks up to see the top of the lighthouse is y°. find the height, h, of the lighthouse. find the angle, rounded to the nearest tenth of a degree, in which kelly looks up to the top of the lighthouse. to the nearest tenth of a degree, find the value of x° . in two or more sentences, explain your calculations