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_iq _IQatan2(_iq A,_iq B);

/**********************************************************************************************************************************
* Function Name  : _IQatan2
* Description    :The arc tangent function of the IQ format number, which can calculate the points in 4 quadrants: atan2(A,B)
* Input          : A is the Y-axis coordinate value in IQ format, B is the X-axis coordinate value in IQ format
* Return         : The radian value of the angle between the point (B, A) and the X axis, the same as the IQ format of the parameter
**********************************************************************************************************************************/