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ATan2(Y,X)

ATan2: `REAL`

function, the exact type being the result of cross-promoting the
types of all the arguments.

`Y`: `REAL`

; scalar; INTENT(IN).

`X`: `REAL`

; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

Returns the arc-tangent (inverse tangent) of the complex
number (`Y`, `X`) in radians.

See Tan Intrinsic, for the inverse of this function.