challenging problems (no limit)

1. (1/csc2(X))+(1/sec2(X))=3
   
2. 1/csc2(X)=3/2
3. sec2(X)-1=1

answers

1. 60°+360k°, 240°+360k°, 120°+360k°, 300°+360k°
   
2. 45°+360k°, 135°+360k°, 225°+360k°, 315°+360k°
   
3. 45°+360k°, 135°+360k°, 225°+360k°, 315°+360k°