Problem 1QCE: The gradient of fx,y,z=xy2z3 at the point 1,1,1 is . Problem 2QCE: Suppose that the differentiable function fx,y has the property that f2+s32,1+s2=3ses The directional... Problem 3QCE: If the gradient of fx,y at the origin is 6i+8j, then the directional derivative of f in the... Problem 4QCE: If the gradient of then fx,y,zat1,2,3is2i2j+k, the maximum value for a directional derivative of f... Problem 1ES: Find Duf at P. fx,y=1+xy3/2;P3,1;u=12i+12j Problem 2ES: Find Duf at P. fx,y=sin5x3y;P3,5;u=35i45j Problem 3ES: Find Duf at P. fx,y=ln1+x2+y;P0,0;u=110i310j Problem 4ES: Find Duf at P. fx,y=cx+dyxy;P3,4;u=45i+35j Problem 5ES Problem 6ES: Find Duf at P. fx,y,z=yexz+z2;P0,2,3;u=27i37j+67k Problem 7ES: Find Duf at P. fx,y,z=lnx2+2y2+3z2;P1,2,4;u=313i413j1213k Problem 8ES: Find Duf at P. fx,y,z=sinxyz;P12,13,;u=13i13j+13k Problem 9ES: Find the directional derivative of f at P in the direction of a. fx,y=4x3y2;P2,1;a=4i3j Problem 10ES: Find the directional derivative of f at P in the direction of a. fx,y=9x32y3;P1,0;a=ij Problem 11ES: Find the directional derivative of f at P in the direction of a. fx,y=y2lnx;P1,4;a=3i+3j Problem 12ES: Find the directional derivative of f at P in the direction of a. fx,y=excosy;P0,/4;a=5i2j Problem 13ES: Find the directional derivative of f at P in the direction of a. fx,y=tan1y/x;P2,2;a=ij Problem 14ES: Find the directional derivative of f at P in the direction of a. fx,y=xeyyex;P0,0;a=5i2j Problem 15ES: Find the directional derivative of f at P in the direction of a. fx,y,z=xy+z2;P3,0,4;a=i+j+k Problem 16ES: Find the directional derivative of f at P in the direction of a. fx,y,z=yx2+z2;P3,1,4;a=2i2jk Problem 17ES: Find the directional derivative of f at P in the direction of a. fx,y,z=zxz+y;P1,0,3;a=6i+3j2k Problem 18ES: Find the directional derivative of f at P in the direction of a. fx,y,z=ex+y+3z;P2,2,1;a=20i4j+5k Problem 19ES: Find the directional derivative of fatP in the direction of a vector making the counterclockwise... Problem 20ES: Find the directional derivative of fatP in the direction of a vector making the counterclockwise... Problem 21ES: Find the directional derivative of fatP in the direction of a vector making the counterclockwise... Problem 22ES: Find the directional derivative of fatP in the direction of a vector making the counterclockwise... Problem 23ES: Find the directional derivative of fx,y=xx+y at P1,0 in the direction of Q1,1. Problem 24ES: Find the directional derivative of fx,y=exsecyatP0,/4 in the direction of the origin. Problem 25ES: Find the directional derivative of fx,y=xyeyatP1,1 in the direction of the negative y-axis. Problem 26ES: Let fx,y=yx+y Find a unit vector u for which Duf2,3=0. Problem 27ES: Find the directional derivative of fx,y,z=yx+z at P2,1,1 in the direction from PtoQ1,2,0. Problem 28ES: Find the directional derivative of the function fx,y,z=x3y2z52xz+yz+3x at P1,2,1 in the direction of... Problem 29ES Problem 30ES Problem 31ES Problem 32ES: The accompanying figure shows some level curves of an unspecified function fx,y. Of the gradients at... Problem 33ES: Find zorw. z=sin7y27xy Problem 34ES: Find zorw. z=7sin6x/y Problem 35ES: Find zorw. z=6x+7y6x7y Problem 36ES Problem 37ES Problem 38ES: Find zorw. w=xe8ysin6z Problem 39ES Problem 40ES: Find zorw. w=e5xsecx2yz Problem 41ES: Find the gradient of f at the indicated point. fx,y=5x2+y4;4,2 Problem 42ES: Find the gradient of f at the indicated point. fx,y=5sinx2+cos3y;/2,0 Problem 43ES: Find the gradient of f at the indicated point. fx,y=x2+xy3;1,1 Problem 44ES: Find the gradient of f at the indicated point. fx,y=x2+y21/2;3,4 Problem 45ES: Find the gradient of f at the indicated point. fx,y,z=ylnx+y+z;3,4,0 Problem 46ES: Find the gradient of f at the indicated point. fx,y,z=y2ztan3x;/4,3,1 Problem 47ES: Sketch the level curve of fx,y that passes through P and draw the gradient vector at P.... Problem 48ES: Sketch the level curve of fx,y that passes through P and draw the gradient vector at P.... Problem 49ES: Sketch the level curve of fx,y that passes through P and draw the gradient vector at P.... Problem 50ES: Sketch the level curve of fx,y that passes through P and draw the gradient vector at P.... Problem 51ES: Find a unit vector u that is normal at P1,2 to the level curve of fx,y=4x2y through P. Problem 52ES: Find a unit vector u that is normal at P2,3 to the level curve of fx,y=3x2yxy through P. Problem 53ES Problem 54ES Problem 55ES Problem 56ES: Find a unit vector in the direction in which f increases most rapidly at P, and find the rate of... Problem 57ES: Find a unit vector in the direction in which f increases most rapidly at P, and find the rate of... Problem 58ES Problem 59ES: Find a unit vector in the direction in which f increases most rapidly at P, and find the rate of... Problem 60ES: Find a unit vector in the direction in which f increases most rapidly at P, and find the rate of... Problem 61ES Problem 62ES Problem 63ES: Find a unit vector in the direction in which f decreases most rapidly at P, and find the rate of... Problem 64ES: Find a unit vector in the direction in which f decreases most rapidly at P, and find the rate of... Problem 65ES Problem 66ES: Find a unit vector in the direction in which f decreases most rapidly at P, and find the rate of... Problem 67ES: Determine whether the statement is true or false. Explain your answer. In each exercise, assume that... Problem 68ES: Determine whether the statement is true or false. Explain your answer. In each exercise, assume that... Problem 69ES Problem 70ES Problem 71ES: Given that f4,5=2ij, find the directional derivative of the function f at the point 4,5 in the... Problem 72ES: Given that fx0,y0=i2j and Dufx0,y0=2, find u (two answers). Problem 73ES: The accompanying figure shows some level curves of an unspecified function fx,y. (a) Use the... Problem 74ES: The accompanying figure shows a topographic map of a hill and a point P at the bottom of the hill.... Problem 75ES: Let z=3x2y2. Find all points at which z=6. Problem 76ES: Given that z=3x+y2, find z at the point 5,2. Problem 77ES: A particle moves along a path C given by the equations x=tandy=t2. If z=x2+y2, find dz/ds along C at... Problem 78ES: The temperature (in degrees Celsius) at a point x,y on a metal plate in the xy-plane is... Problem 79ES: If the electric potential at a point x,y in the xy-plane is Vx,y, then the electric intensity vector... Problem 80ES: On a certain mountain, the elevation z above a point x,y in an xy-plane at sea level is... Problem 81ES: Given that the directional derivative of fx,y,z at the point 3,2,1 in the direction of a=2ij2kis5... Problem 82ES Problem 83ES: Let r=x2+y2. aShowthatr=rr,wherer=xi+yj.bShowthatfr=frr=frrr. Problem 84ES: Use the formula in part (b) of Exercise 83 to find afriffr=re3rbfriffr=3r2randf2=1. Problem 85ES: Let ur be a unit vector whose counterclockwise angle from the positive x-axis is , and let u be a... Problem 86ES: Prove: If fandg are differentiable, then af+g=f+gbcf=cfcconstantcfg=fg+gfdfg=gffgg2efn=nfn1f. Problem 87ES: A heat-seeking particle is located at the point P on a flat metal plate whose temperature at a point... Problem 88ES: A heat-seeking particle is located at the point P on a flat metal plate whose temperature at a point... Problem 89ES: Use a graphing utility to generate the trajectory of the particle together with some representative... Problem 90ES: Use a graphing utility to generate the trajectory of the particle together with some representative... Problem 91ES: (a) Use a CAS to graph fx,y=x2+3y2ex2+y2. (b) At how many points do you think it is true that... Problem 92ES: Prove: If x=xtandy=yt are differentiable at t, and if z=fx,y is differentiable at the point xt,yt,... Problem 93ES: Prove: If f,fx,andfy are continuous on a circular region, and if fx,y=0 throughout the region, then... Problem 94ES Problem 95ES: Given that the functions u=ux,y,z,v=vx,y,z,w=wx,y,z,andfu,v,w are all differentiable, show that... format_list_bulleted