Least common multiple of 15,10,and 3

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

Due to a packaging error, 4 cans labeled diet soda were accidentally filled with regular soda and placed in a 12 pack carton of diet soda. two cans were randomly selected from this 12 pack. what is the probability that both cans were regular soda?

15 points what is the end behavior of this graph? & what is the asymptote of this graph?