1. The problem statement, all variables and given/known data If sin x = 1/3 and sec y = 5/4, where x and y lie between 0 and pi/2, evaluate the expression. sin2y cos2y 2. Relevant equations 2siny = 2siny*cosy? cos2y = cos^2 y - sin^2 y? 3. The attempt at a solution I think sin2y goes to 2siny*cosy. I know what sin x is but how do I find sin y? The answer should be 24/25 for siny, but not sure how to get it. Not sure what the answer is or how to get it for cos2y.