Solve 3 cos(x) + 5 cos(x) - 2 = 0 for the interval 0?x? 2?a) 1.231 and 5.052b) 1.231c) 1.231, 2.356, 2.759 and 5.052d) 5.052

Solve 3 cos²(x) + 5 cos(x) - 2 = 0 for the interval 0?x? 2?a) 1.231 and 5.052b) 1.231c) 1.231, 2.356, 2.759 and 5.052d) 5.052