Help please there is a pic

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

Raymond just got done jumping at super bounce trampoline center. the total cost of his session was $43.25 . he had to pay a $7 entrance fee and $1.25 for every minute he was on the trampoline. write an equation to determine the number of minutes (t) that raymond was on the trampoline.

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3