cscx = 2 = 1/sinx, sinx = 1/2, reference angle is 30 degrees = pi/6. It's a 1-sqr3-2 right triangle. Hypotenuse =2, opposite side = 1. sinx and cscx are positive only in quadrants I and II.
x = pi/6, 5pi/6, - 7pi/6 or - 11pi/6
or 30, 150, -330 or -210 degrees