Problem 1RE: Let f(x,y)=exlny.Find (a)f(lny,ex)(b)f(r+s,rs). Problem 2RE: Sketch the domain of f using solid lines for portions of the boundary included in the domain and... Problem 3RE: Show that the level curves of the cone z=x2+y2 and the paraboloid z=x2+y2 are circles, and make a... Problem 4RE: (a) In words, describe the level surfaces of the functionf(x,y,z)=a2x2+a2y2+z2,wherea0. (b) Find a... Problem 5RE Problem 6RE Problem 7RE Problem 8RE: Let z=fx,y. (a) Express z/x and z/y as limits. (b) In words, what do the derivatives... Problem 9RE: The pressure in newtons per square meter N/m2 of a gas in a cylinder is given by P=10T/V with T in... Problem 10RE: Find the slope of the tangent line at the point 1,2,3 on the curve of intersection of the surface... Problem 11RE: Verify the assertion. If =tan(x2+y2)+xy,thenxy=yx. Problem 12RE: Verify the assertion. If =ln(3x3y)+cos(x+y),then2/x2=2/y2. Problem 13RE: Verify the assertion. If F(x,y,z)=2z33(x2+y2)z, then F satisfies the equation Fxx+Fyy+Fzz=0. Problem 14RE: Verify the assertion. If f(x,y,z)=xyz+x2+ln(y/z),thenfxyzx=fzxxy. Problem 15RE: What do fanddf represent, and how are they related? Problem 16RE: If =x2y2xy+y2x, find the increment and the differential d if (x, y) varies from (1,0)to(1.1,0.1). Problem 17RE: Use differentials to estimate the change in the volume V=13x2h of a pyramid with a square base when... Problem 18RE: Find the local linear approximation of f(x,y)=sin(xy) at 13,. Problem 19RE: Suppose that z is a difierentiable function of x and y with zx(1,2)=4andzy(1,2)=2 If x=x(t)andy=y(t)... Problem 20RE: In each part. use, Theorem 13.5.3 to find dy/dx. (a)3x25xy+tanxy=0(b)xlny+sin(xy)= Problem 21RE Problem 22RE Problem 23RE: (a) How are the directional derivative and the gradient of a function related? (b) Under what... Problem 24RE: In words, what does the derivative Duf(x0,y0) tell you about the surface z=f(x,y)? Problem 25RE: Find Duf(3,5)forf(x,y)=yln(x+y)ifu=35i+45j. Problem 26RE: Suppose that f(0,0)=2i+32j. (a) Find a unit vector u such that Duf(0,0) is a maximum. What is this... Problem 27RE: At the point (1,2), the directional derivative Duf is 22 toward P12,3 and 3 toward P2(1,0). Find... Problem 28RE: Find equations for the tangent plane and normal line to the given surface at P0.... Problem 29RE: Find all points P0 on the surface z=2xy at which the normal line passes through the origin. Problem 30RE: Shows that for all tangent planes to the surface x2/3+y2/3+z2/3=1 the sum of the squares of the x-,... Problem 31RE: Find all points on the paraboloid z=9x2+4y2 at which the normal line is parallel to the line through... Problem 32RE: Suppose the equations of motion of a particle are x=t1,y=4et,z=2t,wherex=t1,y=4et,z=2t,wheret0.... Problem 33RE Problem 34RE Problem 35RE Problem 36RE Problem 37RE Problem 38RE: Solve these exercises two ways: (a) Use the constraint to eliminate a variable. (b) Use Lagrange... Problem 39RE Problem 40RE: In economics, a production model is a mathematical relationship between the output of a company or a... Problem 41RE: In economics, a production model is a mathematical relationship between the output of a company or a... Problem 42RE: In economics, a production model is a mathematical relationship between the output of a company or a... format_list_bulleted