874 
MEMORIAS ClENTiFlCAS I LITEKAKIAS 
Logaritmica. 
r Lx dx 1 p d (L x)- 
J l + (Lx)'^“ir 2 J l + (Lx)^ 
= Y ai’cHg (Lx) 
Trigonometricas. 
52. L sen m x = f sen m x d m x — cos m x 
' m in 
(Timmermans, 252) 
53. /xsen (00^— x)^ — / sen (90^ — x) d (90^ — x) 
= ^ — [ — cos (9Qo — x) ] = sen x . 
54. / X sen (a d + b) / sen (a 0 + b) d (a d + b) 
3 
= g- cos (a 0 + b) 
55. /x x» - 1 sen (a + b x» ) == ^ cos (a + b x^i ) 
56. /x cos ax = — sen ax 
■ a 
Si 
5 7 . y^x 3;b cos (b X + c) = sen (b x + c) 
