In Exercises 49-58, use a graphing utility to approximate the solutions (to three decimal places) of the equation in the interval [0, 257). 49. 2 sin x + cos x = 0 50. 4 sin' x + 2 sin2 x - 2 sin x - 1 = 0 1 + sin x cos x cos x cot x 51. + 4 52. COS X 1 + sin x 1 - sin r = 3