In some cases, it is imp ossible to find the exact value of an improp er int egral, but it is imp ort ant to det ermin e whet her the integral converges or diverges. Supp ose the function f and g are contin- uous and 0< g (x)< S(x) on the int erval (a, oc). It can be shown that if f (x) dx converges, 9 (2) dr converges, and if / f (2) dr diverges, then 9(2) d.r also diverges. This then is known as Comparison Test for improper integrals. (a) Use the Comparison Test to det er mine whether e=**dx converges or diverges. (Hint: Use the fact that e

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In some cases, it is imp ossible to find the exact value of an improp er integral, but it is imp ort ant
to det ermin e whet her the integral converges or diverges. Supp ose the function f and g are contin-
uous and 0< g (r) < f (x) on the int erval [a, oc). It can be shown that if / f(x) dx converges,
then / 9 (a) da converges, and if f (x) dæ diverges, then
| 9(x) dæ also diverges. This
is known as Comparison Test for improper integrals.
(a) Use the Comparison Test to det er mine whether
e*dx converges or diverges. (Hint:
Use the fact that e- <e¯" for r > 1.)
(b) Use the Compari son Test to det ermine whether
L dr convergesor diverges. (Hint:
15 +1
1
Use tha fact that
for r 2 1.)
Transcribed Image Text:In some cases, it is imp ossible to find the exact value of an improp er integral, but it is imp ort ant to det ermin e whet her the integral converges or diverges. Supp ose the function f and g are contin- uous and 0< g (r) < f (x) on the int erval [a, oc). It can be shown that if / f(x) dx converges, then / 9 (a) da converges, and if f (x) dæ diverges, then | 9(x) dæ also diverges. This is known as Comparison Test for improper integrals. (a) Use the Comparison Test to det er mine whether e*dx converges or diverges. (Hint: Use the fact that e- <e¯" for r > 1.) (b) Use the Compari son Test to det ermine whether L dr convergesor diverges. (Hint: 15 +1 1 Use tha fact that for r 2 1.)
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