2' For a onevariable function, if there are two local maximum points, there is denitely a minimum point in between them. Is this true for multivariable functions as well? Let's nd out! Locate the critical points of the function f (as, y) : 4513289 211:4 e49 and determine the nature of these points. [6 marks] 3. Evaluate ff sianA R Where R is the region as shown in the gure below. [Hints Deciding the limits of integration is the key. All the limits can be found in the diagram!] [6 marks]