360 



Enfinfoit '^UU^m^Gn.irkt _ cof^, c ' e ft-a-dire 



is col. a lin.it ht fin. •+ 



1 cot. it he 



cot. \J/ = -r— - r e- tang. 1} , 



T /2 cof. » ° 



& nous aurons 



y == S • [ (cof ivht -+- j8 fin. »j fin. zV&t)' ■+- (|3 c °fi n fin. wA*)*] 



X cof. [(1 -4-i|t*)At-+-\}/ — *} 



ou bien , en faifant 



A = I V [ 4£il -+- -LZ^l cof. 1 £»At -+- 18 fin. q fin. z i»At] 



& A = * — \J/ — j'jwAf, 



y = A cof. ( A * — A ) . 



De meme , ii on fait n 1 -*- n r = i p h , m — «i 



= 1 j-A, enforte que 



/ + /' V((/-/)- + 4 0^) 

 p = _ r , cr = -3 , 



enfuite 



_ (/-/QB -h *gB' 



& de plus 



i? = — X . fin. g , C = X cof. e , 

 B \ = — X 1 fin. e 1 , C 1 = X 1 cof. f 1 , 



,_, - cor. i ht , '■ 

 cot. c = - 1- tang, a, 



enfin 



A = Xv^[ ' "** y% " -4- i-Zl2L cof. liVAt -+■ y fin. a fin. z«-At] 



& E = s — Z, — iphty 

 on aura par 1' equation ( x ) 



z = A fin. ( h t — E ). 



