Question 746536
4sin^2x - 1 + 0
4 sin^2x = 1
  sin^x = 1/4
Take square root of both sides
  sin x = + and - 1/2

Because the square root has been taken of the 
angle both positive and negative values must
be included.

      x = 30, 150, 210, 330, 390, 510,
          570, 690, 750, 870, 930.

        [ interval 0, 960}