#NEWLINE# def fdiff( self , argindex = 1 ) : #NEWLINE# #INDENT# if ( argindex == 1 ) : #NEWLINE# #INDENT# return ( 1 / sqrt ( ( 1 - ( self . args [ 0 ] ** 2 ) ) ) ) #NEWLINE# #UNINDENT# else : #NEWLINE# #INDENT# raise ArgumentIndexError ( self , argindex )