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

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Sec. 6] Integrat<strong>in</strong>g Certa<strong>in</strong> Irrational Functions<br />

Whence<br />

Example 2.<br />

Mult<strong>ipl</strong>y<strong>in</strong>g by V^* 2 + 4 and equat<strong>in</strong>g the coefficients of identical degrees oi<br />

A-,<br />

we obta<strong>in</strong><br />

Hence,<br />

3. Integrals<br />

of the form<br />

i;<br />

-<br />

= -<br />

dx<br />

a) n V ax<br />

; D-0;<br />

X=_<br />

They are reduced to <strong>in</strong>tegrals of the form (2) by the substitution:<br />

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

1326 .<br />

j__^_.<br />

A a<br />

1329.<br />

1327. (-f^dx. 1330.<br />

fv -^<br />

v<br />

Vl-i<br />

-^^rfjc. 1331.<br />

4. Integrals of the b<strong>in</strong>omial differentials<br />

FA' 2<br />

X+l<br />

x t (5)<br />

where m, n and p are rational numbers.<br />

Chebyshev's conditions. The <strong>in</strong>tegral (5) can be expressed <strong>in</strong> terms of a<br />

f<strong>in</strong>ite comb<strong>in</strong>ation of elementary functions only <strong>in</strong> the follow<strong>in</strong>g three cases:<br />

1) if p is a whole number;<br />

2) if<br />

"<br />

is a whole number. Here, we make the substitution a + bx n =<br />

n<br />

= z s where s is the denom<strong>in</strong>ator of the fraction t p;<br />

3) if<br />

m<br />

+p is a whole number. Here, use is made of the substitution

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