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3- Find the extremum of functional J(y) = (1-y)1-y dx (20 marks) a- y(0)= y(1) 0 b- y(0)=0, y(1)= free 3- Find the extremum of functional J(y) = (1-y)1-y dx (20 marks) a- y(0)= y(1) 0 b- y(0)=0, y(1)= free