Hi Cos^2x -Sin^2x+3Sinx-2=0 |Cos^2x = 1-sin^2x 1-Sin^2x -Sin^2x+3Sinx-2=0 -2Sin^2x + 3sinx - 1 = 0 factoring (-2Sinx +1)(Sinx - 1) = 0 (-2Sinx +1)=0 Sinx = 1/2 x = pi/6, 5pi/6 (Sinx - 1) = 0 Sinx = 1 x = pi/2