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Flash Player 5. In Flash Player 4, the methods and properties of the Math class are emulated using approximations and may not be as accurate as the non-emulated math functions supported by Flash Player 5.
Math.atan(x)
x A number.
A number.
Method; computes and returns the arc tangent for the number specified in the parameter x. The return value is between negative pi divided by 2, and positive pi divided by 2.
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