— 439 — 



!W=H-J ;(i)ff« (•)-£ '(0~» (3) -5 (3)-*(4)-rft) 

 - 1(5) — ■ + (5) H-/, 

 et coefficiens sin 2fc in aequatione II, {[sive < 



M = - s (4) -4- <?(4) -*(*) -t- $(5) - ? ( 9 ) -<r (io) 



H- T (l0) — l (il) + \J/ (ll) -f- €, 



est porro w =: 2t, ^ =z jx :n 2 j unde fit ( j. 8.) coefficien» 

 cos 2 £ in abscissa x, seu 



et coefficiens sin 2f in ordinata y % h. e. 



Unde sequentes nascuntur aequationes * 



i) a = -+-/-(*»+!) c+^ [A_6-H(i)]H- f [(m-f-Oft) — WJ 



- i [(» + (4) ■*- (»)] + * [(m H- i) (5) - (3)1 



— 5 [(m+i) (5) 4- (3)].-4- e(w-r-»)(9)-Hr[(m-Hi)(i»)-(4)] 



- * [(m-f- 1) (io) -+- (4)] -h 2 [£« + ») (»i) - (5)] 



— ^- [(m+0 (iij + (5)]; 



2 ) o — — c + 4* (m-H r) -f- * (4) - i (4) •+■ n (5) — 3- (5) 

 •+■ s [4 -h (9)] -h » (10) — * (10) •+■ 2 (11) — -4> (»*)• 



$.21. Coeffieiens cos (zp — zt) est 



^zzr-^-f-^z)-^^)-,^)-^^)-^)-^^)-^ 

 et coefficiens sin Qzp — zt) vel 



Mz=:-^4)-e(5)- ? (ia)-<r(9)-r(ii)-h2(io)-hf. 



Praeterea est » zz ap — 2i, ideoque p zzz -^r — Szz2(wi— l), 

 unde coefficientes ejusdem argumenti in coordinatis x, jr*, ($. 8.) 

 sequentes uanciscuntur valores : 



