If anyone can answer this thank you!!

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

Triangles abc and dfg are given. find the lengths of all other sides of these triangles if: b ∠a≅∠d, ab·dg=ac·df, ac=7 cm, bc=15 cm, fg=20 cm, and df-ab=3 cm.

Find all the angles that satisfy the equation cos(θ)=32