Cos^2 (x)-5sin (x)-3=0
Cos²x - 5sinx - 3 = 0 1 - sin² x - 5sinx - 3 = 0 -sin²x - 5sinx - 2 = 0 D = b² - 4ac = 25 - 4*(-1)*(-2) = 17 5-√17 sinx = --------- -2 5+√17 sinx= ----------- -2