Did I write correctly?

Question

Mathematics

I can’t figure out where the mistake is guys, with me or in the task

double y = 1.3 * Math.Pow(Math.E,x / -2.0) + Math.Abs(Math.Cos(2.0 * Math.PI * x / 3.0 - 1.4)) - (6.0 / 11.00);

Answer 1

the error could be here Math.Cos(2.0 * Math.PI * x / 3.0 - 1.4), because you need to watch how the cosine is calculated, for example, Cos (1) is the cosine of 1 radian or the cosine of 1 radius, for good, hammer each action into the calculator separately, then do the same in the program, compare the result and find out where the error is