# paper5 - estimate. 2. Approximate Z 1 ln( x ) cos( x ) dx...

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MAT126, Paper Homework 5 1. After being kidnapped on a trip to Canada, little Jimmy was able to see the speedometer of the kidnapper’s car, and carefully noted down the speeds every tenth of an hour (six minutes). (Since they are in Canada,the speeds are in km/hr). Jimmy was able to communicate these speeds to his friend Juan via text message, and Juan wants to ﬁgure out how far away Jimmy is from where they grabbed him. time t 0 .1 .2 .3 .4 .5 .6 .7 .8 .9 1 speed v ( t ) 30 60 81 93 94 80 70 40 52 20 0 Using the midpoint rule, estimate the total distance (in km) that Jimmy was taken in the one hour, that is, estimate the integral Z 1 0 v ( t ) dt . (Use only the data provided– don’t average to guess at speeds between the given times.) Under the assumption that - 10 v 00 ( t ) 10, also determine the maximum error in your
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Unformatted text preview: estimate. 2. Approximate Z 1 ln( x ) cos( x ) dx using Simpson’s rule with 4 intervals, and give an estimate on the error of your approximation. You can get around the problem of ln(0) cos(0) not being deﬁned as follows. First integrate by parts, and then it is reasonable to take sin(0) / 0 = 1 since lim x → sin( x ) x = 1. Similarly, you can use L’Hospital’s rule to determine that lim x → + ln( x ) sin( x ) = 0. So that you don’t kill yourself taking derivatives, I’ll tell you that the 4th derivative of sin( x ) /x is (( x 4-12 x 2 + 24) sin( x ) + (4 x 3-24) cos( x )) /x 5 , which is between-1 / 5 and 1 / 5 for any value of x ....
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## This note was uploaded on 10/21/2010 for the course MAT 126 taught by Professor Sutherland during the Spring '07 term at SUNY Stony Brook.

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