36 DÉTERAnNATION THÉORIQUE DE LA VARIATION 



Mettons a- — b" = c'\ a^ — ab = e- 



r-(\ - x') - a;» „ c" - aV 



\r-a{'^ - x^) + (1 - a)x^\^ "^ " c^ - eV)-^ 

 c- — a^x^ b(a + b) a 1 



+ 



(c- - e'x'f {c' - eVj^ ' a-b(c- - e'x'f 



a 





dx 

 ?xY 



Va" - V 



a 

 _ i dx ^ l dx 



p 



c- — e^a;-)^ j ^' ~ e-x-)- 



j _ ± 1 j^ Va 



' 16 Va(a- b){a- - ¥)V2 ^^ ^ _ Ja^ 



1 5a — 3(a — b) 



4a (a^ - 62)% 2p *" 



1 + i/^^^l^ 

 1 Val 1 



Va{a- b) (a' - V'fl^ ^ _ / a-b 2 6(„2 _ ^2fl, 



-b 



. 3 1 a' (a + b) . 



I = - Q :;:2 — r^ t t^=^ log 



-b 



Sa" -b- b y„(a _ 6, ^ _ jg _ 



1 1 a2, , ^^ 5o - 3(a - 6) 



