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The Line Integral

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Submitted By Muhit
Words 561
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EXERCISE-04

The line integral

Evaluate [pic]

a) If [pic] and C

i) is the line segment from z = 0 to z = 1+i

ii) consists of two line segments, one from z = 0 to z = i and other from z = i to z = i+1.

b) If f(z) = z2 and C is the line segment from z = 0 to z = 2+ i

c) If f(z) = z2 and C consists of two line segments, one from z = 0 to z = 2 and other from z = 2 to z = 2+i.

d) If f(z) = 3z + 1 and C follows the figure

e) If [pic] , C is a circle [pic]and [pic]

f) If [pic] and the path of integration C is the upper half of the circle [pic] from z = -1 to z = 1.

g) If [pic] and C is

1) the semicircle [pic] 2) the semicircle [pic] 3) the circle [pic]

h) If [pic] and C is the arc from z = -1 - i to z = 1 + i along the curve [pic].

i) If [pic] and C is the curve from z = 0 to z = 4+2i given by [pic].

j) Evaluate [pic] along:

a) The parabola [pic] [pic]

b) Straight line from (0, 3) to (2, 3) and then from (2, 3) to (2, 4)

c) A straight line from (0, 3) to (2, 4).

EXERCISE-05

1. State Cauchy-Goursat theorem .

2. Verify Cauchy-Goursat theorem for the function [pic], if C is the circle [pic] (b) the circle [pic].

3. State the Cauchy’s integral formula and Cauchy Residue Theorem.

4. Evaluate by Cauchy’s integral formulae and by Residue theorem

(a) [pic]

(b) [pic]

(c) [pic]

(d) [pic]

(e) [pic]

(f) [pic]

5. Let C denotes the boundary of a square with boundary lines [pic] and [pic] described positively. Evaluate [pic]. 6. Evaluate [pic] where C is the circle [pic], [pic] and [pic] 7. Evaluate [pic] where C is the circle [pic].

8. Evaluate [pic] where C is (a) [pic]

(b) the square with vertices at [pic]

9. Evaluate [pic] around the square with vertices at [pic]

10. Evaluate [pic] where C is the square with vertices at [pic]

11. Evaluate by Cauchy’s integral formulae and by Residue theorem

[pic] [pic] [pic] [pic]

EXERCISE-06

1. State Taylor’s and Laurent’s theorems. 2. Show that [pic] 3. Show that [pic]; [pic] 4. Show that [pic]; [pic]

5. Obtain Laurent series expansion of [pic] when [pic], [pic] [pic] when [pic],

6. Expand [pic]in a Laurent series valid for

[pic].

7. Expand [pic]in a Laurent series valid for

[pic]

8. Expand [pic]in a Laurent series valid for

[pic]

9. If [pic], find a Laurent series of f(z) about [pic] convergent for [pic] 10. Find the zeros and poles of [pic], and determine the residues at the poles.

EXERCISE-07
Applications of residues

1. Integration of the form [pic] (Improper integral)
Evaluate the following by Cauchy Residue Theorem:
(i) [pic] (ii) [pic] (iii) [pic] (iv) [pic] (v) [pic] (vi) [pic] (vii) [pic] (viii) [pic] (ix) [pic] (x) [pic] (xi) [pic] (xii) [pic].

2. Integration of the form [pic] (Definite integral)

(i) [pic], (ii) [pic] (iii) [pic] (iv) [pic] (v) [pic] (vi) [pic]

(vii) [pic] (viii) [pic] (ix) [pic] (x) [pic]

----------------------- y

(0, 1) (1, 1)

O (0,0) (1, 0) x

(

(

(

(

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