I've become stumped on these last two problems and would appreciate any and all help.
1)Find all the solutions in degrees to 21sin2(theta)+10sin(theta)=-1. Round your answers to one decimal place.
2) Let pi < alpha < 3pi/2 ; pi/2 < beta < pi ; cos(alpha) = -4/9 ; sin(beta)= 7/12. Find the exact value for each of the following: