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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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130 Indef<strong>in</strong>ite Integrals [Ch. 4<br />

4) Integrals of the form f tanw xdx (or V cot w xdx), where m is an <strong>in</strong>-<br />

tegral positive number, are evaluated by<br />

(or, respectively, cot* x = cosec* x 1).<br />

the formula<br />

Example 5. \ tan*xdx= V tan 2 x (sec*x 1) dx=-^-^<br />

tan 1 x P. . tv . tan* x ,<br />

= =<br />

\ (sec*x l)dx= tanx -5 + x+C.<br />

5 J 3<br />

, , ~<br />

\ tan*xdx =<br />

5) In the general case, <strong>in</strong>tegrals 7 m>n of the form (1) are evaluated by<br />

means of reduction formulas that are usually derived by <strong>in</strong>tegration by parts.<br />

Example 6. \ = = \<br />

J cos* x J cos<br />

s<strong>in</strong> A; dx<br />

s<strong>in</strong> x<br />

F<strong>in</strong>d the <strong>in</strong>tegrals:<br />

1338. Jcos'xdx.<br />

1339. Js<strong>in</strong>'xdx.<br />

1 340.<br />

1341. \<br />

1342.<br />

1343.<br />

1344.<br />

1 345.<br />

J s<strong>in</strong> 2 x cos 8<br />

x dx.<br />

C x x<br />

8<br />

s<strong>in</strong> -jr cos 5<br />

-~- dx.<br />

J * *<br />

-<br />

s<strong>in</strong>* x<br />

^ sm*xcos*xdx.<br />

J s<strong>in</strong> 1 A: cos 4 x dx.<br />

1346. Jcos'Sxdx.<br />

COS ' X<br />

1 1 C cos x .<br />

, f<br />

c-^ cos x<br />

2^^"j<br />

{;<br />

1352.<br />

J s<strong>in</strong> COS<br />

-2 'T<br />

1353.<br />

1354. J<br />

1355. JsecMxdx.<br />

1356. Jtan !<br />

1357.<br />

1358.<br />

1359.<br />

1360.<br />

5jcdA:.<br />

jjcot'*d*.<br />

1362.<br />

J s<strong>in</strong>'xi/cosxdx.<br />

1363.<br />

dx<br />

.<br />

f<br />

J V s<strong>in</strong> x cos* *<br />

1364. f-==.<br />

J l^tan*

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