MATH116 Lecture 15: M116F15_P11sol
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9 Dec 2015
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Practice solutions 11: find the area enclosed between the curves y = x and y = 5x x2. Solution: first we nd the point(s) of intersection: It helps to graph each function to see which is larger where: We can see that the area enclosed between them is on the interval [0, 4], and y = 5x x2 is larger. Thus the area enclosed between them is (cid:19) (0 0) (cid:90) 4 (5x x2) x dx = 3: consider the function f (x) = sin(2x). (a) find the average value of f on the interval [0, . 4 ]. (b) find the average value of f on the interval [0, 4 ]. 8 (cos(8 ) cos(0)) = 0: find the volumes of the following solids generated by rotating the region bounded by the given curves about the speci ed line. Solution: (a) the region is sketched as follows: and the solid is sketched as follows:
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