derived by using the following asymptotic relation
for
the function
J.:
'M-i^TH^-T-d-
O"-^-'"
This approximation
is
good
to 1% or
better
for P > 15.
Choosing
n = I and
j8
= i; or
8v,
as
appropriate,
Eq.
(10.2.8) becomes
i(P)
= -^ - cos i;
—7-
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