that's a pretty nasty equation to solve, where did you get that?
I did some Newton's Method on it, but it converged rather slowly to an answer, I finally trimmed it up with a bit of "trial and error" at the end and got
theta = 1.146 as the answer closest to the origin.
Off-hand I don't know how to find the period of the trig expression, perhaps a good graphing tool could illustrate it.
once you have the period, you add/subtract that from my answer to get multiple solutions.
BTW, obviously my answer would be in radians.
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