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_iq _IQatan(_iq A);

/**********************************************************************************************************************************
* Function Name  : _IQatan
* Description    : The arc tangent function of the IQ format number, to calculate the points in the first and fourth quadrants: atan(A)
* Input          : Parameter A is the number in IQ format
* Return         : The return value is between -pi/2 and pi/2, the same as the IQ format of the parameter
**********************************************************************************************************************************/