btw,
which means, SIN(ATAN(x/y)) * COS(ATAN(x/y)) = TAN (ATAN (x/y)) / (1 + TAN^2 (ATAN(x/y))) = (x/y) / (1 + (x/y)^2) = (x * y) / (x^2 + y^2), right?
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