1. The problem statement, all variables and given/known data find x if sin(x)=1/5 2. Relevant equations x=arcsin(1/5)= ??something in closed form maybe?? 3. The attempt at a solution This actually isnt my homework. A student im tutoring in differential calculus came to me with this problem and im convinced it is a typo. Just for certainty, is there a closed form for this? I started messing around with complex numbers and series... so i thought it might be time to ask here. Thanks!