#NEWLINE# def fun( self , x , * args ) : #NEWLINE# #INDENT# self . nfev += 1 #NEWLINE# return ( ( ( 4 / 3 ) * ( ( ( ( x [ 0 ] ** 2 ) + ( x [ 1 ] ** 2 ) ) - ( x [ 0 ] * x [ 1 ] ) ) ** 0.75 ) ) + x [ 2 ] )