142 
MEM OKI AS CIENTIFICAS I LITER AE IAS 
Forma fundamental: 
f — d x = L x 
J x 
9 / zb dx-± f — — d x = dt L >, 
10. [-—d x-a dx = aLx = L(x a ) 
11 
. f — 3 — dX r= =l (x— a) 
J x— a ■' x— a 
12. /-^dx = A./'iii£+bl = i.L(a 
j ax + b sl J ax + b a 
x + b) 
r f 1 x , /-d(lx) j , o \ 
!3. y — dx = y- F ^=L(fx). 
d^f_x) 
f X 
dx. 
La sustitucion trigonometrica nos da, haciendo 
x = tg 6> . • . dx = sec 2 0 d 0, 
1 + x:L = sec 2 0: 
/l+x T ' dX = /' 
sec 2 0 d $ 
sec 2 6 d 0 
J d 0 = 0= arc tg x 
