118 RELATIONS BETWEEN SEVERAL [BOOK 1. 



X- -*- 



7.10 



, 3.6 



&quot;13715* 



, 9.12 

 ~ X 



1 etc. 

 The law according to which the coefficients 



6 2 5. 8 1.4 



5 ~~6T7 779 97n 



proceed is obvious; in truth, the n h term of this series is, when n is even, 



n 3. n 

 2n 



when n is odd, 



the further development of this subject would be too foreign from our purpose. 

 If now we put 



_2_ 

 577* 

 8.8&quot; 



1 etc. 

 we have 



