An Elementary Treatise On the Planetary Theory, With a Collection of Problems

Cover An Elementary Treatise On the Planetary Theory, With a Collection of Problems
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51. The principal part of the coefficient of a term in E, of tJie form P cos { (pn + qn') t + Q} is of the order p + q.
This term arises from the multiplication of such terms as P x C ° S {{Jen - Jen) t+ Q t ), with P 2 1™ {[( P -k)n+(q + Jc) n'] t+Q,}, and P 3 C ° S {[(p + 7c)n+(q- Jc) «'] t + Q 3 ], sm and as in the last Article, the order of the principal part of P will be equal to the lesser of those of P, and P 3 .
48 PLANETARY THEORY.
Now the order of the principal part of P 2 will be the
... least value which the arithmetical sum oip~k and q + k can assume, for different values of k.
(i) Suppose k less than p ; then this sum =p —k+q+k =p + q.
(ii) Suppose k not less thanp; then this sum = k —p + q + k, the least value of which (by putting k equal to p) =p + q.
Similarly it may be shewn that p + q will be the order of the principal part of P 3 .
Hence it follows that p + q will be the order of the principal part of P.
In Art. 44 we have assumed that (a 2 + a' 1 — 2aa' cos )~" can be expanded in a series of cosines of and its multiples, we shall now give a proof of this and shew how the coeffi- cients may be calculated.


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