HELP PLEASE ITS DUE NOW

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Will give brainliest for correct answer 8. use the distance time graph to answer these questions: a. what does the graph tell us about the velocity of the car? b. what is the average velocity of the car? (show work) c. is the velocity reflected in the graph positive or negative?d. is there any point on the graph where the car is not moving? how do we know?

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?