Problem 1QCE: Letfx,y=xsinxy.Thenfxx,y=andfyx,y=. Problem 2QCE: The slope of the surface z=xy2 in the x-direction at the point 2,3is, and the slope of this surface... Problem 3QCE: The volume V of a right circular cone of radius r and height h is given by V=13r2h. (a) Find a... Problem 4QCE Problem 1ES Problem 2ES Problem 3ES Problem 4ES Problem 5ES Problem 6ES Problem 7ES Problem 8ES Problem 9ES: Evaluate the indicated partial derivatives. z=sin5x2y+7xy2;zx,zy Problem 10ES Problem 11ES: Let fx,y=3x+2y. (a) Find the slope of the surface z=fx,y in the x-direction at the point 4,2. (b)... Problem 12ES Problem 13ES: Let z=siny24x. (a) Find the rate of change of z with respect to x at the point 2,1 with y held... Problem 14ES Problem 15ES: Use the information in the accompanying figure to find the value of the first-order partial... Problem 16ES Problem 17ES Problem 18ES: Use the table in Exercise 17 and the method of Example 6 to estimate (a) the partial derivative of r... Problem 19ES Problem 20ES: What can you say about the sign of z/x,2z/x2,z/y,and2z/y2 at the point P in the accompanying figure?... Problem 21ES: Determine whether the statement is true or false. Explain your answer. If the line y=2 is a contour... Problem 22ES: Determine whether the statement is true or false. Explain your answer. If the plane x=3 intersects... Problem 23ES: Determine whether the statement is true or false. Explain your answer. If the graph of z=fx,y is a... Problem 24ES: Determine whether the statement is true or false. Explain your answer. There exists a polynomial... Problem 25ES Problem 26ES Problem 27ES: Find z/xandz/y. z=x3ln1+xy3/5 Problem 28ES Problem 29ES Problem 30ES Problem 31ES Problem 32ES Problem 33ES Problem 34ES Problem 35ES: Find fxx,yandfyx,y. fx,y=y2tanx4/3 Problem 36ES Problem 37ES Problem 38ES Problem 39ES Problem 40ES Problem 41ES Problem 42ES: Letw=x2ycosz.Findaw/xx,y,zbw/yx,y,zcw/zx,y,zdw/x2,y,zew/y2,1,zfw/z2,1,0. Problem 43ES: Findfx,fyandfz.fx,y,z=zlnx2ycosz Problem 44ES Problem 45ES Problem 46ES Problem 47ES Problem 48ES Problem 49ES Problem 50ES Problem 51ES Problem 52ES: w=3x2y22z2 w/x(2,1,1) w/y(2,1,1) w/z(2,1,1) Problem 53ES: Let fx,y=excosy. Use a graphing utility to graph the functionsfx0,yandfyx,/2. Problem 54ES: Let fx,y=exsiny. Use a graphing utility to graph the functions fx0,yandfyx,0. Problem 55ES: A point moves along the intersection of the elliptic paraboloid z=x2+3y2 and the plane y=1. At what... Problem 56ES: A point moves along the intersection of the elliptic paraboloid z=x2+3y2 and the plane x=2. At what... Problem 57ES Problem 58ES: Find the slope of the tangent line at (1,1,5) to the curve of intersection of the surface z=2y23x3y... Problem 59ES: The volume V of a right circular cylinder is given by the formula V=r2h, where r is the radius and h... Problem 60ES: The volume V of a right circular cone is given by V=24d24s2d2 where s is the slant height and d is... Problem 61ES Problem 62ES Problem 63ES: The length, width, and height of a rectangular box are l=5,w=2,andh=3, respectively. (a) Find the... Problem 64ES: The area A of a triangle is given by A=12absin, where a and b are the lengths of two sides and is... Problem 65ES: The volume of a right circular cone of radius r and height h is V=13r2h. Show that if the height... Problem 66ES Problem 67ES: (a) By differentiating implicitly, find the slope of the hyperboloid x2+y2z2=1 in the x-direction at... Problem 68ES: (a) By differentiating implicitly, find the slope of the hyperboloid x2+y2z2=1 in the y-direction at... Problem 69ES: Calculate z/x and z/y using implicit differentiation. Leave your answers in terms of x, y, and z 69.... Problem 70ES Problem 71ES: Calculate z/xandz/y using implicit differentiation. Leave answer in terms of x,y,andz. x2+zsinxyz=0 Problem 72ES Problem 73ES Problem 74ES: Find w/x,w/y,andw/z using implicit differentiation. Leave your answer in terms of x,y,zandw.... Problem 75ES Problem 76ES Problem 77ES: Findfxandfy. fx,y=yxet2dt Problem 78ES: Find fx and fy 78. f(x,y)=0x2y3et3dt Problem 79ES: Findfxandfy. fx,y=0x2y3et2sint3dt Problem 80ES: Findfxandfy. fx,y=x+yxysint3dt Problem 81ES Problem 82ES Problem 83ES Problem 84ES Problem 85ES Problem 86ES: Confirm that the mixed second-order derivatives of f are the same. fx,y=x2+y2 Problem 87ES: Confirm that the mixed second-order derivatives of f are the same. fx,y=excosy Problem 88ES Problem 89ES Problem 90ES: Confirm that the mixed second-order derivatives of f are the same. fx,y=lnx2+y2 Problem 91ES Problem 92ES Problem 93ES: Express the following derivatives in notation. afxxxbfxyycfyyxxdfxyyy. Problem 94ES: Express the derivatives in “subscript� notation. a3fy2xb4fx4c4fy2x2d5fx2y3 Problem 95ES: Given fx,y=x3y52x2y+x,find afxxybfyxycfyyy. Problem 96ES Problem 97ES Problem 98ES Problem 99ES: Letfx,y,z=x3y5z7+xy2+y3z.Findafxybfyzcfxzdfzzefzyyffxxygfzyxhfxxyz. Problem 100ES Problem 101ES: Show that the function satisfies Laplace’s equation... Problem 102ES: Show that the function satisfies the heat equation zt=c22zx2c0,constantaz=etsinx/cbz=etcosx/c Problem 103ES: Show that the function ux,t=sinctsinx satisfies the wave equation [Equation (6)] for all real values... Problem 104ES: In each part, show that ux,yandx,y satisfy the Cauchy-Riemann equations ux=yanduy=x... Problem 105ES Problem 106ES Problem 107ES: Find the indicated derivatives. f,w,x,y=42w3x4y5;f/,f/w,f/x,f/y Problem 108ES: Find the indicated derivatives. w=rcosst+eusinur;w/r,w/s,w/t,w/u Problem 109ES Problem 110ES: Find the indicated derivatives. V=xe2xy+wezw+yw;V/x,V/y,V/z,V/w Problem 111ES Problem 112ES Problem 113ES: Findw/xifori=1,2,...,n. w=cosx1+2x2++nxn Problem 114ES: Findw/xifori=1,2,...,n. w=k=1nxk1/n Problem 115ES: Describe the largest set on which Theorem 13.3.2 can be used to prove that fxyandfyx are equal on... Problem 116ES: Describe the largest set on which Theorem 13.3.2 can be used to prove that fxyandfyx are equal on... Problem 117ES Problem 118ES: Letfx,y=x2+y22/3.Showthatfxx,y=4x3x2+y21/3,x,y0,00,x,y=0,0 Problem 119ES: Let fx,y=x3+y31/3. (a) Show that fy0,0=1. (b) At what points, if any, does fyx,y fail to exist? Problem 120ES Problem 121ES format_list_bulleted