Please I need a step by step explanation ASAP thank you​

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

Afootball is throw by a quarterback to a receiver

The numbers on a football field indicate 10 yard increments. you walk around the perimeter of a football field between the pylons. you walk a distance of 30623 yards. find the area and perimeter of the indicated regions. write your answers as mixed numbers, if necessary. a. one end zone: perimeter: yd area: yd2 b. the playing field (not including end zones): perimeter: yd area: yd2 c. the playing field (including end zones): perimeter: yd area: yd2