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

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302 Series [Ch. 8<br />

s<strong>in</strong> na<br />

2481. (_l)"l^, 2482. ( ly-'tan ^<br />

n^i<br />

n V n<br />

yourself that<br />

2483. Conv<strong>in</strong>ce yourself that the d'Alembert test for convergence<br />

ide the quesl<br />

does not decide the question of the convergence of the<br />

series 2 a > where<br />

whereas by means of the Cauchy test it is possible to establish<br />

that this series converges.<br />

2484*. Conv<strong>in</strong>ce yourself that the Leibniz test cannot be<br />

applied to the alternat<strong>in</strong>g series a) to d). F<strong>in</strong>d out which of<br />

these series diverge, which converge conditionally and which con-<br />

verge absolutely:<br />

_J___l<br />

a)<br />

'<br />

| j<br />

" .j;<br />

1 _1_ . .<br />

1<br />

3 +y 3F + 2 1 3?+<br />

v i_ .<br />

'<br />

3<br />

_ L __u<br />

*~ 2<br />

3 3<br />

" h 5 3*<br />

r<br />

" ' ' '<br />

!<br />

] !<br />

J !<br />

^\ i .<br />

i<br />

.<br />

d) T<br />

_l + _<br />

T T + _<br />

TT T +...<br />

Test the follow<strong>in</strong>g series with complex terms for convergence:<br />

CO 00<br />

2485. ^2+#. 2488. V.<br />

00 00<br />

' (2<br />

2486, X" 37 1) ''. 2489.<br />

1=1 =i

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