Find the Direction in Which the Function Decreases Fastest

Q88: Use the Chain Rule to find <img

Q89: Let <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB5971/.jpg" alt="Let and

Q90: Find the critical points of the function.

Q91: Use partial derivatives to find the implicit

Q92: Find the first partial derivatives of the

Q94: Find an equation of the tangent plane

Q95: Evaluate the gradient of f at the

Q96: Find equations for the tangent plane and

Q97: Find <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB5971/.jpg" alt="Find ,

Q98: Find the equation of the tangent plane