1. The problem statement, all variables and given/known data Find the exact value of the given expressions. Code (Text): sin (2 sin[SUP]-1[/SUP] (4/5)) or sin (2 arcsin (4/5)) Just two different ways of writing it 2. Relevant equations maybe 3. The attempt at a solution I've only gotten this far: Code (Text): sin (2 arcsin (4/5)) = 2 sin (arcsin (4/5)) I think i might need to use: if -1 <= x <= 1, then sin(arcsin (x)) = x and cos(arccos (x)) = x. But I am not entirely sure. Any help explaining this to me?