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Fig. 5.25 Positional
relationship of geodesic and
reciprocal normal sections
Fig. 5.26 Differential
relationships of geodesics
MdB
ᄐ
dS cos A
:
We see that:
cos A
M
dB
ᄐ
dS,
ð
5
:
49
Þ
and rdL
ᄐ
dS sin A.
sin A
r
sin A
N
So dL
ᄐ
dS
ᄐ
sec BdS
:
ð
5
:
50
Þ
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