3 20 points Given a surface z = f(x, y) = ye. (the notation ':=' means...
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3 20 points Given a surface z = f(x, y) = ye. (the notation ':=' means 'define as') 1. Find partial derivatives: (use same input rules for functions as stated in earlier assignments) Zx f(x,y) type your answer... Zyfy(x, y) type your answer... that contains more products) Evaluate: f(0,2)= type your answer... 2. Evaluate f(0,2) = type your answer... (need product rule, do not pull out any common factor to the front, write the individual exponential term before the term fy(0, 2) type your answer... Find the tangent plane of the surface at the point that has coordinates x = 0, y = 2: (of course this point should be on the surface, you can find its z coordinate) If this tangent plane is written as z = ax+by+c, then a type your answer... b= type your answer... 3. This tangent plane gives the linear approximation of f(x, y) at the point (0, 2). That is, the linear function type your answer... L(x, y) ax+by+c using the above computed values of a, b, c provides approximation of f(x, y). The approximation can be quite good for (x, y) close to the point (0, 2). The approximation generally becomes poor for (x, y) not close to (0, 2). Now you verify this statement, for the linear approximation, use L(x, y) to evaluate, then compare the value with f(x, y). (Comment: You need calculator for f(x, y), but L(x, y) can be computed by hand.) For your input, round all values to 3 decimal places (keep or add ending zeros to make all input to have 3 decimal digits for comparison): L(0.01, 2.02) type your answer... f(0.01, 2.02) type your answer... L(0.01, 2.1) L(0.1, 2.1) type your answer... f(0.01, 2.1) type your answer... type your answer... L(1, 1) type your answer... f(0.1, 2.1) f(1, 1) type your answer... type your answer... 3 20 points Given a surface z = f(x, y) = ye. (the notation ':=' means 'define as') 1. Find partial derivatives: (use same input rules for functions as stated in earlier assignments) Zx f(x,y) type your answer... Zyfy(x, y) type your answer... that contains more products) Evaluate: f(0,2)= type your answer... 2. Evaluate f(0,2) = type your answer... (need product rule, do not pull out any common factor to the front, write the individual exponential term before the term fy(0, 2) type your answer... Find the tangent plane of the surface at the point that has coordinates x = 0, y = 2: (of course this point should be on the surface, you can find its z coordinate) If this tangent plane is written as z = ax+by+c, then a type your answer... b= type your answer... 3. This tangent plane gives the linear approximation of f(x, y) at the point (0, 2). That is, the linear function type your answer... L(x, y) ax+by+c using the above computed values of a, b, c provides approximation of f(x, y). The approximation can be quite good for (x, y) close to the point (0, 2). The approximation generally becomes poor for (x, y) not close to (0, 2). Now you verify this statement, for the linear approximation, use L(x, y) to evaluate, then compare the value with f(x, y). (Comment: You need calculator for f(x, y), but L(x, y) can be computed by hand.) For your input, round all values to 3 decimal places (keep or add ending zeros to make all input to have 3 decimal digits for comparison): L(0.01, 2.02) type your answer... f(0.01, 2.02) type your answer... L(0.01, 2.1) L(0.1, 2.1) type your answer... f(0.01, 2.1) type your answer... type your answer... L(1, 1) type your answer... f(0.1, 2.1) f(1, 1) type your answer... type your answer...
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