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In this case we observe that z1 = z2 = -1, hence the line joining the points P1 and P2 lies in the z = -1 plane and can be represented by the equation
Or, y = 3x -2
d
y
= 3 d
x
Fundamentals of Antennas and Radiating systems
For evaluating the line integral along the parabola
, we find that
d
y
= 2
x
d
x