For the following exercises, let f(x)=sin x.
31. On [0,2π), solve f(x)=0.
34. On [0,2π),f(x)=2√2. Find all values of x.

For the following exercises, let f(x)=cos x.
39. On [0,2π), solve f(x)=12.
42. On [0,2π), solve the equation f(x)=3√2.