You want to calculate radians=tan(y/x) first.
Then you can convert it to degrees:
radians = atan(y/x) degrees = radians * (180.0/3.141592653589793238463)
See the reference here for atan:
On a side note, you also have to take into account what quadrant you are in to get the correct answer (since -y/x is the same number as y/-x)
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