(2) Find the-maximal and minimal values of function f(1:.y) under the constraint 2 153: +3353 Hint: 1 5 3'32 + y2 S 3 represents an annular region between the two circles 2 2 a: +y2=1 and :1: +y2=3. Step 1: Find all stationary points of f (1:, y) satisfying 1 s 1:2 + y2 s 3 (inside the annular region). Step 2: Find the maximal and minimal values on the two circles, i.e.. under constraint 1'2 + y2 : 1 and under constraint 3:2 + y2 : 3, respectively. by using the method in part (1). Step 3: Compare the function values of f(:1:,y) at the points obtained in Step 1 and Step 2 to nd the maximal and minimal values