le* sinxdx

e* sm X — cos x

DO

ir

oo

|(TT^* = 2L^^«*g* + n:^j

Remarque. — Pour a; = oo , lira — ^ — = lim — ==

rfr»

iz = 2 arc tg v/2 — arc tg 1 j

= 2 arc tg 1/2 — - .

lir

dx

arc tg

3ic+l

('lH-iz;)t/i +x-a;* L \'ly\^x—x'

= arc tg (2) - arc tg- = arctg -— == arc tg^ .

rfa;

(1+ecosx)* ^1 ^,,^1

^ t /l — e e - arc tg\/

2 — sin« X 2[/i

— soda: ît

-j- e cos X j/| ^i

Applications.