Both 1 and 2 consists of the family...

For #1, you get two angles, and another angle. Just keep in mind the quadrants where sine is positive! I'll leave it for you to find the other angle.

However, for #2, we see that we can manipulate the equation a little bit:

We will get two different equations:

and

Keep in mind the restriction on the angle :

Also keep in mind which quadrants tangent is positive!

I hope this helps.

--Chris