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atan2() - math

This function calculates the arc tangent of the two variables x and y. It is similar to calculating the arc tangent of y / x, except that the signs of both arguments are used to determine the quadrant of the result.

The function returns the result in radians, which is between -PI and PI (inclusive).

Parameters :
  • y - Dividend parameter
  • x - Divisor parameter

  • Syntax

    float atan2
         ( float $y
        , float $x


    Output / Return Value


    Alternatives / See Also