Anybody wanna google meet?

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

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

How many grams the dog will eat in 3 days?