1- Assume that x, y € R and z = x + iy € c.Calculate the following integrals using the given contour and assuming that R → 00, e → 0 and Ap → 0. 0o In(x) dx 1+x2 а- CR b- S. dx Jo 1+x2 -R 00 Vx

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter8: Further Techniques And Applications Of Integration
Section8.2: Integration By Parts
Problem 3E
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1- Assume that x, y E R and z = x+ iy € C.Calculate the following integrals using the given contour
and assuming that R - 00, 8 - 0 and Aø - 0.
0o In(x)
Jo Itx2
a-
CR
0 Vx
b- So
CE
0 1+x2
C2
-R
-E
00 Vx
c- So
1+x2
0o In(x)
d- So
(4+x?)2
co In² (x)
е-
2+x2
2ni E Residue = Sc +e,+og+G,(). Prove
co. For S,(.) use z = egi® and evaluate the contribution from this term. For
(Hint 1: Use
that Sa(..) = 0 as R →
part e), first solve dx then expand log (2) function as (log|z| + iArg(=)*)
In(x)
2+x2
(Hint 2: Here for log and sqrt functions the principal branch definitions can be employed.)
Transcribed Image Text:1- Assume that x, y E R and z = x+ iy € C.Calculate the following integrals using the given contour and assuming that R - 00, 8 - 0 and Aø - 0. 0o In(x) Jo Itx2 a- CR 0 Vx b- So CE 0 1+x2 C2 -R -E 00 Vx c- So 1+x2 0o In(x) d- So (4+x?)2 co In² (x) е- 2+x2 2ni E Residue = Sc +e,+og+G,(). Prove co. For S,(.) use z = egi® and evaluate the contribution from this term. For (Hint 1: Use that Sa(..) = 0 as R → part e), first solve dx then expand log (2) function as (log|z| + iArg(=)*) In(x) 2+x2 (Hint 2: Here for log and sqrt functions the principal branch definitions can be employed.)
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