Question: please help me with this 9.1 ) Determine for function f (2:, y) = cos(a:2 + y2)determine the Taylor expansion up to degree 2 at

please help me with this

please help me with this 9.1 ) Determine for
9.1 ) Determine for function f (2:, y) = cos(a:2 + y2)determine the Taylor expansion up to degree 2 at point (0,1). 9.2 In which direction does the directional deriVatiVe of the function f(xa y) =111(392 + 92) at point_ (x/Z \\/6) the Value 0? 9.3 Find the points on the Ellipsoid 53:2 +5312 +3z2 = 4, haVe maximum or minimum distance to the origin 9.4 The 800-mrunning track in a stadium consists of two parallel stretches of length I and two attached semicircles with radius 7". (a) Make a sketch! (b) How must I and I be chosen so that the football area A - becomes as large as possible? (0) How big is the maximum area? (d) How must I and I be chosen so that the total area is as large as possible

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