Calculus. One and several variables by S.L. Salas, Einar Hille

By S.L. Salas, Einar Hille

A revised and up-to-date presentation of calculus with functions to engineering and the sciences. adjustments contain an early remedy of the calculus of the trigonometric features, an elevated use of Riemann definition of the essential, the advent of numerous numerical ideas, an early bankruptcy on mathematical modeling, increased and balanced workout units, prompt techniques for challenge fixing, revised proofs, and extra examples. bankruptcy thirteen is contained in either half I and half II.

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Suppose that ab > 0. Show that if a < b, then 1/b < 1/a. 50. Given that a > 0 and b > 0, show that if a 2 ≤ b2 , then a ≤ b. √ √ 51. Show that if 0 ≤ a ≤ b, then a ≤ b. 17 52. Show that |a − b| ≤ |a| + |b| for all real numbers a and b. 53. Show that |a| − |b| ≤ |a − b| for all real numbers a and b. 2 HINT: Calculate |a| − |b| . 54. Show that |a + b| = |a| + |b| iff ab ≥ 0. 55. Show that if 0 ≤ a ≤ b, b a ≤ . 1+a 1+b then 56. Let a, b, c be nonnegative numbers. Show that if a ≤ b + c, then b c a ≤ + .

A right triangle is formed by the coordinate axes and a line through the point (2,5). ) Express the area of the triangle as a function of the x-intercept. 6 THE ELEMENTARY FUNCTIONS The functions that figure most prominently in single-variable calculus are the polynomials, the rational functions, the trigonometric functions, the exponential functions, and the logarithm functions. These functions are generally known as the elementary functions. Here we review polynomials, rational functions, and trigonometric functions.

28. 0 < |x| < 12 . 29. 0 < |x − 2| < 12 . 30. 0 < |x − 12 | < 2. 31. 0 < |x − 3| < 8. 32. |3x − 5| < 3. 1 34. |5x − 3| < 12 . 33. |2x + 1| < 4 . 35. |2x + 5| > 3. 36. |3x + 1| > 5. Exercises 37–42. Each of the following sets is the solution of an inequality of the form | x − c |< δ. Find c and δ. 4 COORDINATE PLANE; ANALYTIC GEOMETRY 37. (−3, 3). 38. (−2, 2). 39. (−3, 7). 40. (0, 4). 41. (−7, 3). 42. (a, b). Exercises 43–46. Determine all numbers A > 0 for which the statement is true. 43. If |x − 2| < 1, then |2x − 4| < A.

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