Problem 260E: For the following exercises, find the directional derivative using the limit definition only. 260.... Problem 261E: For the following exercises, find the directional derivative using the limit definition only. 261.... Problem 262E: For the following exercises, find the directional derivative using the limit definition only. 262.... Problem 263E: For the following exercises, find the directional derivative of the function at point P in the... Problem 264E: For the following exercises, find the directional derivative of the function at point P in the... Problem 265E: For the following exercises, find the directional derivative of the function at point P in the... Problem 266E: For the following exercises, find the directional derivative of the function at point P in the... Problem 267E: For the following exercises, find the directional derivative of the function at point P in the... Problem 268E: For the following exercises, find the directional derivative of the function at point P in the... Problem 269E: For the following exercises, find the directional derivative of the function at point P in the... Problem 270E: For the following exercises, find the directional derivative of the function at point P in the... Problem 271E: For the following exercises, find the directional derivative of the function at point P in the... Problem 272E: For the following exercises, find the directional derivative of the function at point P in the... Problem 273E: For the following exercises, find the directional derivative of the function at point P in the... Problem 274E: For the following exercises, find the directional derivative of the function in the direction of the... Problem 275E: For the following exercises, find the directional derivative of the function in the direction of the... Problem 276E: For the following exercises, find the directional derivative of the function in the direction of the... Problem 277E: For the following exercises, find the directional derivative of the function in the direction of the... Problem 278E: For the following exercises, find the directional derivative of the function in the direction of the... Problem 279E: For the following exercises, find the directional derivative of the function in the direction of the... Problem 280E: For the following exercises, find the gradient. 280. Find the gradient of f(x,y)=14x2y23 . Than,... Problem 281E: For the following exercises, find the gradient. 281. Find the gradient of f(x,y,z)=xy+yz+xz , at... Problem 282E: For the following exercises, find the gradient. 282. Find the gradient of f(x,y,z) at P and in the... Problem 283E: For the following exercises, find the gradient. 283. f(x,y,z)=4x5y2z3,P(2,1,1),u=13i+23j-23k Problem 284E: For the following exercises, find the directional derivative of the function at point P in the... Problem 285E: For the following exercises, find the directional derivative of the function at point P in the... Problem 286E: For the following exercises, find the derivative of the function at P in the direction of u. 286.... Problem 287E: For the following exercises, find the derivative of the function at P in the direction of u. 287.... Problem 288E: [T] Use technology to sketch the level curve of (x. y) = 4x — 2y + 3 that passes through P(1. 2) and... Problem 289E: [T] Use technology to sketch the level curve of f(x,y)=x2+4y2that passes through P(—2. 0) and draw... Problem 290E: For the following exercises, find the gradient vector at the indicated point. 290.... Problem 291E: For the following exercises, find the gradient vector at the indicated point. 291.... Problem 292E: For the following exercises, find the gradient vector at the indicated point. 292.... Problem 293E: For the following exercises, find the gradient vector at the indicated point. 293.... Problem 294E: For the following exercises, find the derivative of the function. 294. f(x,y)=x2+xy+y2at point (-5,... Problem 295E: For the following exercises, find the derivative of the function. 295. f(x,y)=exy at point (6. 7) in... Problem 296E: For the following exercises, find the derivative of the function. 296. f(x,y)=arctan(yx) at point... Problem 297E: For the following exercises, find the derivative of the function. 297. f(x,y,z)=ln(xy+yz+zx)at point... Problem 298E: For the following exercises, find the derivative of the function. 298. f(x,y,z)=xy+yz+zx at point... Problem 299E: For the following exercises, find the maximum rate of change of f at the given point and the... Problem 300E: For the following exercises, find the maximum rate of change of f at the given point and the... Problem 301E: For the following exercises, find the maximum rate of change of f at the given point and the... Problem 302E: For the following exercises, find equations of a. the tangent plane and b. the normal line to the... Problem 303E: For the following exercises, find equations of a. the tangent plane and b. the normal line to the... Problem 304E: For the following exercises, find equations of a. the tangent plane and b. the normal line to the... Problem 305E: For the following exercises, find equations of a. the tangent plane and b. the normal line to the... Problem 306E: For the following exercises, solve the problem. 306. The temperature T in a metal sphere is... Problem 307E: For the following exercises, solve the problem. 307. The electrical potential (voltage) in a certain... Problem 308E: For the following exercises, solve the problem. 308. If the electric potential at a point (x. y) in... Problem 309E: For the following exercises, solve the problem. 309. In two dimensions, the motion of an ideal fluid... format_list_bulleted