Please help! Look at photo

Adriver from the university of florida women’s swimming and diving team is competing in the in ncaa zone b championships

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

Formulate alisha has a number in mind. if she adds three to her number the result is less than five. use this information to write and solve an inequality about alisha's number. then graph the solution set.