1. The problem statement, all variables and given/known data Angles x and y are located in the first quadrant such that sinx=4/5, and cosy = 7/25. a) Determine an exact value of cosx. b) Determine an exact value of siny. c) Determine an exact value for sin(x+y) 2. Relevant equations Compound angle formulas perhaps? I don't really know, thats the problem! 3. The attempt at a solution I'm really at a loss here, do I just sub those in to some formula or something? Can anyone help me out? Or get me pointed in the right direction? thanks in advance!!