Josh Engwer (TTU) Improper Integrals 10 March / 21
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1 Improper Integrals Calculus II Josh Engwer TTU 10 March 2014 Josh Engwer (TTU) Improper Integrals 10 March / 21
2 Limits of Functions (Toolkit) TASK: Evaluate limit (if it exists): lim f (x) x x0 READ: The limit as x approaches x 0 of f (x) Naïve Substitution (NS) Factor Polynomial(s) & cancel like factors Rationalize Numerator/Denominator (RN/RD) Combine Fractions Throw a factor downstairs (TFD) Change of Variables (CV): Let u = g(x), then limit becomes Apply a Trig Identity L Hôpital s Rule (LHOP) Find One-Sided Limits first Sketch the Function Squeeze Theorem Build a Table TOO INACCURATE! δ-ɛ definition of limit TOO HARD! lim h(u) u g(x 0) Josh Engwer (TTU) Improper Integrals 10 March / 21
3 Limits of Functions (Infinity) Remember, is not a real number, but rather a symbol indicating growth without bound. Similarly, indicates decay without bound. However, ± satisfy some arithmetic properties that agree with intuition (x R, n N): + = + x = x + = + x = x = ( )( ) =, ( )( ) =, = ( )( ) = ( )( ) = x > 0 = x = and x ( ) = x < 0 = x = and x ( ) = n = n = Josh Engwer (TTU) Improper Integrals 10 March / 21
4 Limits of Functions (Indeterminant Forms) Recall the seven indeterminant forms from Single Variable Calculus: 0 0,, 0,, 00, 0, 1 Remember that L Hôpital s Rule (LHOP) only works with 0 0 or : f (x) NS lim = 0 LHOP f (x) = lim x x 0 g(x) 0 x x0 g (x) f (x) NS lim = LHOP f (x) = lim x x 0 g(x) x x0 g (x) Convert 0 0, 0, 1 to 0 by: Taking the natural logarithm: ln A k = k ln A Convert 0 to 0 0 or by: Throwing a factor downstairs/upstairs Convert to by: Combining fractions or Rationalizing numerator Josh Engwer (TTU) Improper Integrals 10 March / 21
5 Limits of Functions (Naïve Substitution) WORKED EXAMPLE: Evaluate lim t t. NS lim 5 + t = 5 + (4) = 9 = 3 t 4 ( ) WORKED EXAMPLE: Evaluate lim x 2/3 7. x ( ) lim x 2/3 NS 7 = ( ) 2/3 7 = 7 = x WORKED EXAMPLE: Evaluate lim x 0 + x2 ln x. lim x2 ln x NS = 0 ( ) = 0 = Rewrite/Simplify Function x 0 + TFD = lim x 0 + ln x 1/x 2 NS = LHOP 1/x = lim x 0 + 2/x 3 = lim 1 x x2 NS = 1 2 (0)2 = 0 Josh Engwer (TTU) Improper Integrals 10 March / 21
6 Unbounded Intervals Recall from Calculus I the definitions bounded & unbounded intervals: Definition The following are all bounded intervals: Open Interval (a, b) Closed Interval [a, b] Half-open Intervals (a, b], [a, b) Definition The following are all unbounded intervals: [a, ), (a, ), (, b], (, b), (, ) REMARK: The real line R := (, ) Josh Engwer (TTU) Improper Integrals 10 March / 21
7 Break Discontinuities Recall from Calculus I the definition of a break discontinuity: Definition A function f has a break discontinuity at x = c if at least one 1-sided limit is infinite: [ ] lim f (x) = or x c AND/OR [ ] lim f (x) = or x c + Josh Engwer (TTU) Improper Integrals 10 March / 21
8 Break Discontinuities (Example) Josh Engwer (TTU) Improper Integrals 10 March / 21
9 Break Discontinuities (Example) Josh Engwer (TTU) Improper Integrals 10 March / 21
10 Break Discontinuities (Example) Josh Engwer (TTU) Improper Integrals 10 March / 21
11 Break Discontinuities (Example) Josh Engwer (TTU) Improper Integrals 10 March / 21
12 Improper Integrals Recall from Calculus I the Fundamental Theorem of Calculus (FTC): Theorem Let function f C 1 [a, b]. Then b a f (x) dx = f (b) f (a) Notice that interval [a, b] is bounded & f is continuous on [a, b]. QUESTION: What if the interval is unbounded??... the function has break discontinuities?? ANSWER: The resulting integral is improper. Josh Engwer (TTU) Improper Integrals 10 March / 21
13 Improper Integrals (Unbounded Intervals) Proposition f C[a, ) = a f (x) dx := lim B B a f (x) dx Proposition f C(, b] = b f (x) dx := b lim A A f (x) dx Proposition f C (R) = f (x) dx := c f (x) dx + c f (x) dx, where c R REMARK: The improper integral converges if the corresponding limit exists and is finite. Otherwise, it diverges. WARNING: In general, f (x) dx lim L L L f (x) dx Josh Engwer (TTU) Improper Integrals 10 March / 21
14 Improper Integrals (Break Discontinuities) Proposition Let f C[a, b) s.t. f has a break discontinuity at x = b. b a f (x) dx := lim B b B a f (x) dx Then Proposition Let f C(a, b] s.t. f has a break discontinuity at x = a. Then b a f (x) dx := lim A a + b A f (x) dx Proposition Let f C[a, b] s.t. f has a break discontinuity at x = c (a, b). Then b f (x) dx = c f (x) dx + a a c Josh Engwer (TTU) Improper Integrals 10 March / 21 b f (x) dx
15 Special Limits involving Infinity lim x xn = lim n x = (n N) x lim x 1 x n = lim x 1 n x = 0 (n N) lim ln x = lim log x = lim log x x x 2 x = lim ln x = lim log x = lim log 2 x = x 0 + x 0 + x 0 + lim x ex = lim x 10x = lim x 2x = lim x ex = lim x 10x = lim x 2x = 0 lim arctan x = π/2 x lim arctan x = π/2 x Josh Engwer (TTU) Improper Integrals 10 March / 21
16 Improper Integrals (Example) WORKED EXAMPLE: Evaluate I = x 3 dx. 1 [ I = lim x 3 dx = lim 1 ] x=1 FTC A 0 + A A 0 + 2x 2 = lim x=a A 0 + The region below in red is unbounded and infinite: [ ] 2A 2 = = Josh Engwer (TTU) Improper Integrals 10 March / 21
17 Improper Integrals (Example) WORKED EXAMPLE: Evaluate I = 1 1 x 3 dx. B [ I = lim x 3 dx = lim 1 ] x=b FTC B 1 B 2x 2 = lim B x=1 The region below in green is unbounded yet finite: [ ] 2B 2 = = 1 2 Josh Engwer (TTU) Improper Integrals 10 March / 21
18 Improper Integrals (Example) WORKED EXAMPLE: Compute I = B 1 I = lim B e x ln x dx 2 e 2 1 x ln x dx. CV: Let u = ln x. Then du = 1 x dx and u(b) = ln B, u ( e 2) = ln ( e 2) = 2 ln B CV = lim B FTC = lim B 2 1 du = lim u B ] [ ln(ln B) ln 2 Why is lim ln(ln B) =?? B CV: Let B = ln B. [ ] u=ln B ln u u=2 = ln 2 = lim ln(ln B) CV = lim ln B B B = ( ) i.e. the integral diverges Then, B = ln B = B Josh Engwer (TTU) Improper Integrals 10 March / 21
19 Special Functions Some special functions are defined by improper integrals: Gamma Function: Γ(α) := 0 x α 1 e x dx, where α > 0 Complementary Error Function: erfc(x) := 2 e t2 dt π x Airy Function (of the 1 st kind): Ai(x) := 1 ( ) t 3 cos π 3 + xt dt Airy Function (of the 2 nd kind): Bi(x) := 1 [ exp ( t33 ) ( )] t 3 π + xt + sin 3 + xt dt 0 0 Special functions are special in the sense that they tend to show up often in certain branches of mathematics, statistics, physics, and engineering. IMPORTANT: DO NOT MEMORIZE THESE SPECIAL FUNCTIONS! Josh Engwer (TTU) Improper Integrals 10 March / 21
20 Integral Transforms Improper integrals show up in integral transforms: Laplace Transform: F(s) = L {f (t)} := 0 e st f (t) dt Fourier Transform: f (ω) = F {f (t)} := f (t)e iωt dt Real Number Function Real Number Function of x Function Function of x Function of t Laplace Transform Function of s Function of time t Fourier Transform Function of frequency ω Integral transforms are instrumental for certain differential equations. IMPORTANT: Integral transforms are beyond the scope of this course. Josh Engwer (TTU) Improper Integrals 10 March / 21
21 Fin Fin. Josh Engwer (TTU) Improper Integrals 10 March / 21
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