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10. maj, 2005 SUPPLERENDE OPGAVER TIL KOMPLEKS ...

10. maj, 2005 SUPPLERENDE OPGAVER TIL KOMPLEKS ...

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S 7.6. Bevis for ethvert n ∈ N at<br />

d<br />

dz cotn z = −n cot n−1 z − n cot n+1 z<br />

Sæt rn = Res(cot n z,z = 0) for ethvert n ∈ N, og find en rekursionsformel<br />

for følgen (rn). Find til sidst et eksplicit udtryk for rn.<br />

S 7.7. Bestem residuet<br />

1<br />

Res(<br />

sin3 ,z = 0)<br />

z<br />

S 7.8. Bestem for n ∈ N residuet<br />

<br />

1<br />

Res<br />

(1 + z2 <br />

) n,z = 0<br />

6

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