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# Calculator Calculus by George McCarty

By George McCarty

How THIS e-book DIFFERS This ebook is ready the calculus. What distinguishes it, notwithstanding, from different books is that it makes use of the pocket calculator to demonstrate the idea. A computation that calls for hours of work whilst performed through hand with tables is kind of beside the point for example or workout in a starting calculus path. yet that very same computation can turn into a fragile representation of the speculation whilst the coed does it in seconds on his calculator. t in addition, the student's personal own involvement and straightforward accomplishment provide hello~ reassurance and en­ couragement. The laptop is sort of a microscope, and its magnification is 100 millionfold. we will have an interest in limits, and no level of numerical approximation proves whatever concerning the restrict. despite the fact that, the by-product of fex) = 67.SgX, for example, acquires genuine that means whilst a pupil first appreciates its values as numbers, as limits of 10 a hundred one thousand t a short instance is 1.1 , 1.01 , 1.001 , •••• one other instance is t = 0.1, 0.01, within the functionality e/3t+9-3)/t. ix distinction quotients of numbers, instead of as values of a functionality that's itself the results of summary manipulation.

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Extra info for Calculator Calculus

Example text

987654y 3- 32y-l at Xo = 1/32 Can you find the zeroes) for f(x)? ~ We know what an means for an integer n and a positive number a -n n lin ~ and that a = lla. We also know about a = va, and we can combine these operations to find amln = = (lJ'a)m. This expression represents the positive number that when raised to the nth power ~ gives am. Hence "ax" makes sense when x is a positive rational number; we now assume that we have extended this function to be defined for all positive real xt. 89 and and Xo = 1, xi = x i _1/2.

Xg'(x), givingg'(x) x' = 1 = (fog)'(x) = 2g(x)g'(x) as we proved above by the product rule. ~ O. X, The squaring function and the square-root function are said to be inverse functions for each other where both are defined on the non-negative numbers. The chain rule gives us a method of finding the derivative of a function when we know the derivative of its inverse function. Thus the nth root function g(x) ~ = xl/n is n = x , and 1 = ng(x) n-l g'(x) . h h power f ' f (x) lnverse to tent unctlon n-l nx n g'(x).

DEFINITION: LIMITS OF SEQUENCES We now define more clearly what is meant by convergence. ••• X2, If xo, Xl, is an infinite sequence of numbers, we say that it approaches a number L or has L as a limit or converges to L if: no matter what degree of accuracy we require, there always exists a member xn of the sequence so that xn and also the subsequent members xn+i for i = 1,2,3, ... curacy. all approximate L to within the given degree of ac- The sequences Yo = g. Yl, Y2, •.. of approximations for square roots that we calculated in Chapter 1 were convergent sequences in this sense.