ࡱ> !_ bjbjzz .*B\B\((((<$(.`vvvvQQQ-------$/2-QQQQQ-vv-Q.vv-Q-*,v@eZ\+--0.+D3D3(,,D3,QQQQQQQ--GQQQ.QQQQD3QQQQQQQQQ> : Review for Test 1: Partial Derivatives Multivariable Calculus Format The exam will contain 7 problems (plus or minus 1) and will last 50 minutes. It is a paper and pencil exam. You will need to show your work. You may use a graphing calculator. However, you may not use a symbolic calculator such as the TI-89. If you do not bring an acceptable calculator, you may have to do without. You must be able to answer warm up questions and paraphrase mathematical quotes such as the quote by the Scottish mathematician George Crystal who wrote, Every mathematical book that is worth reading must be read backwards and forwards, if I may use the expression. I would modify Lagrange's advice a little and say, Go on, but often return to strengthen your faith. When you come to a hard or dreary passage, pass it over; and come back to it after you have seen its importance or found the need for it further on. Basic Content. You are responsible for sections 14.1, 14.3-6. In addition to the material covered in the class, you are responsible for all of the basic facts you have learned since kindergarten. These include the facts that Abraham Lincoln was the President of the United States of America,  EMBED Equation.DSMT4 , and that 1/0 is undefined. Regarding drawings This is not an art class you are not expected to give me perfect pictures You should be able to do decent graphing in 2D for domains and contour plots. You should be able to work from a given graph to answer questions related to partial derivatives. Regarding applications: While we havent covered many applications during the lectures to date, there are a limited number of applications in the homework and included among the examples in the text. Other than the partial differential equations and the Cobb-Douglas equation, you should be comfortable with these. The exam will contain at least one graph/diagram to work with and at least one table. That said, the bulk of the exam is computational (calculate, evaluate, solve, find ) In Studying . . . You should be able to recreate every derivation done in class (which isnt very many). You need to know the vocabulary. You should be able to solve every example done in class. You should be able to solve every homework question. Ideas that may help with test prep The review assignment in WebAssign includes questions covering material from all of the material being tested. The problems are jumbled up. Review the most recent material first. Consider recopying your notes. Summarize your notes. Make note cards for important formulas and definitions. Set them aside once the definitions are known. Rework examples from the quiz, class, and homework questions (in this order). In general, review exercises are a good source of practice problems. However, we skipped enough sections in this chapter that this may not be the case for Chapter 14. Practice like you will play do you know the material without your notes when the clock is running? Study with a friend to have more fun. Look to resources such as the MIT videos and Khan Academy to fill in holes. Show up at least five minutes early for the exam. A Summary of the Topics (not necessarily exhaustive) 14.1: Functions of Several Variables Understand the notation of multivariable functions, their domain and range, basic graphing, and how to work from tables. Understand how to create and interpret contour plots/level curves Notice that these are given for equally spaced values of z. While this isnt explicitly stated in the text, it is implied when it talks about steepness correlating to level curves that are close together. The basic concept of a level surface is important to understand, but not critical. We skip over the examples from economics and partial differential equations. 14.2: Multivariate Limits We skipped this section. 14.3: Partial Derivatives You should understand the concept of a partial derivative including the various notations. You should be able to estimate partials based upon graphs and tables, but you do not need to calculate them using limits (we skipped 14.2) You must be able to calculate partials and second partials. You must be able to interpret basic partials. Memorize Clairauts Theorem and know how to apply it. 14.4: Tangent Planes and Linear Approximations You should be able to find tangent planes and use them to find linear approximations. You should be able to show that a function is differentiable at a point. Just show that the partials are continuous at the point. You should be able to calculate the total differential and apply it to basic applications. 14.5: The Chain Rule You should be able to apply the multivariate chain rule. You should be able to use the multivariate chain rule to perform implicit differentiation see the boxes on page 942 and 943 14.6: Directional Derivatives and the Gradient Vector You should be able to calculate the directional derivative. You should know the relationship between the directional derivative and the gradient You should know how the calculate the gradient and understand what it looks like on a graph and contour plot Understand the relationship between the gradient, tangent plane to a level surface, and the normal line. 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