# hmwk2 - between the two planes. 13.5b. Suppose P is the...

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Math 215 Homework Set 2: §§ 13.4 – 13.5 and § 13.7 Fall 2007 Most of the following problems are modiﬁed versions of the recommended homework problems from your text book Multivariable Calculus by James Stewart. 13.4a. Prove the law of cosines. (Hint: Follow the same rules as when you proved the Pythagorean theo- rem.) 13.4b. Suppose a = ± 1 , - 3 , - 2 ² and b = ± 2 , - 1 , 4 ² . Compute a × b . Sketch a , b , and a × b . 13.4c. Find two unit vectors orthogonal to ± 2 , 2 , 4 ² . Can you ﬁnd others? 13.4d. Find two unit vectors which are orthogonal to both ±- 3 , 2 , 5 ² and ± 1 , 3 , 5 ² . Can you ﬁnd any others? 13.4e. Problem 43 of § 13.4 of Stewart’s Multivariable Calculus . Think carefully about how should one deﬁne the distance from P to L . 13.5a. Problem 73 of § 13.5 of Stewart’s Multivariable Calculus . One approach to this problem is to ﬁnd a line perpendicular to both planes and then measure the length of that part of the line that lies
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Unformatted text preview: between the two planes. 13.5b. Suppose P is the plane described by the equation ax + by + cz + d = 0 . Given two points ( x , y , z ) and ( x 1 , y 1 , z 1 ) , how does one go about determining whether or not the two points lie on the same side of the plane. Carefully explain your reasoning. 13.5c. Find the equation of the line consisting of those points which are equidistant from the three points (2 , 1 ,-3) , (3 , 4 ,-1) , and (-2 , 1 ,-1) . 13.7a. A solid lies above the cone z = ± 7( x 2 + y 2 ) and inside the sphere x 2 + y 2 + z 2 = 8 z . Using spherical coordinates, write a description of the solid....
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## This homework help was uploaded on 04/02/2008 for the course MATH 215 taught by Professor Fish during the Fall '08 term at University of Michigan.

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