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

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Sec. 8] Integration of Hyperbolic Functions 133<br />

Sec. 8. Integration of Hyperbolic Functions<br />

Integration of hyperbolic functions is completely analogous<br />

gration of trigonometric functions.<br />

The follow<strong>in</strong>g basic formulas should be remembered:<br />

1) cosh 2 X s<strong>in</strong>h 2<br />

*=l;<br />

2) s<strong>in</strong>h 2 * = ~ (cosh 2* 1);<br />

3) cosh 2 x= Y (cosh 2x+ 1);<br />

4) s<strong>in</strong>h x cosh x = ~ s<strong>in</strong>h 2x.<br />

Example<br />

1. F<strong>in</strong>d<br />

Solution. We have<br />

V cosh 2 *djt.<br />

f cosh 2 x djc-=r~(cosh 2x + \)dx = js<strong>in</strong>h 2x + ^<br />

Example<br />

2. F<strong>in</strong>d<br />

Solution. We have<br />

\ cosh 3 ****.<br />

( cosh 8 xcU= f cosh 2 xd (s<strong>in</strong>h x)= J (l + s<strong>in</strong>h 2<br />

Jc)d(s<strong>in</strong>hA:) =<br />

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

1391. Js<strong>in</strong>h'jtd*.<br />

1392. ^cosh'xdx.<br />

1393.<br />

1394. s<strong>in</strong>h'* cosh*<br />

^<br />

1396 C . .<br />

J s<strong>in</strong>h 2 A: cosh 2 A;<br />

1397.<br />

1398.<br />

1402.<br />

. ,<br />

, = smh x-\<br />

to the <strong>in</strong>te-<br />

Sec. 9. Us<strong>in</strong>g Trigonometric and Hyperbolio Substitutions for F<strong>in</strong>d<strong>in</strong>g<br />

Integrals of the Form<br />

R is a rational function.<br />

(1)

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