TAILIEUCHUNG - Calculus: An Integrated Approach to Functions and their Rates of Change, Preliminary Edition Part 88

Calculus: An Integrated Approach to Functions and their Rates of Change, Preliminary Edition Part 88. A major complaint of professors teaching calculus is that students don't have the appropriate background to work through the calculus course successfully. This text is targeted directly at this underprepared audience. This is a single-variable (2-semester) calculus text that incorporates a conceptual re-introduction to key precalculus ideas throughout the exposition as appropriate. This is the ideal resource for those schools dealing with poorly prepared students or for schools introducing a slower paced, integrated precalculus/calculus course | Slicing to Find the Area Between Two Curves 851 8. Write an integral or the sum or difference of integrals giving the area of the region shaded below. You need not evaluate. 9. Which of the expressions below give the area of the shaded region Select all such expressions. a arctan x dx 3 4 n dx b J01 arctan x dx 3 n dx c J tan y dy d J q 4 3 - tan y dy e o0 3 dy - l o 4 tan y dy f 03 arctan x dx - 3 arctan x - j dx 10. Find the area between the curve y In x and the x-axis for 1 x 10. Get an exact answer. Hint Slice the area perpendicular to the y-axis so that the height of each slice is Ay. Use this to arrive at an integral that you can evaluate exactly. 11. Find exactly the area bounded by x 1 e y ln x and y 1. 852 CHAPTER 27 Applying the Definite Integral Slice and Conquer 12. Find the area bounded below by the x-axis and laterally by y In x and the line segment joining e 1 to 2e 0 . 13. Evaluate J arctan x dx by interpreting it as an area and slicing horizontally. 14. Evaluate 00 5 arcsin x dx. 15. The region A in the first quadrant is bounded by y 2x y 3x 10 and y 9 x2 - 6x . It has corners at 0 0 2 4 and 3 1 . Express the area of A as the sum or difference of definite integrals. You need not evaluate. CHAP More Applications of Integration COMPUTING VOLUMES Volumes by Slicing We compute the signed area of a region in the plane using a divide-and-conquer technique. To find the area under the graph of f we slice the region into n thin slices each of width Ax and approximate the area of each slice by the area of a rectangle. Let Xi a iAx for i 0 1 . n. x a x b n Area X f x Ax i i Where we approximate the height of the z-th slice by X . Figure Summing the areas of the slices and taking the limit as the number of slices increases without bound gives us the area in question. area lim f xi Xx f x dx n . i 1 a We ll take a similar approach to calculating volume. Suppose we want to find the volume of a loaf of bread. It could be a plain shape like a .

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