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Apuntes de Variable Compleja - Carlos Lizama homepage ...

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100 CAPÍTULO 6. EJERCICIOS<br />

107. Evaluar 2π<br />

108. Calcule 2π<br />

0<br />

0<br />

cos(3θ)<br />

5 − 4cos(θ) dθ<br />

dθ<br />

1 + sin 2 θ<br />

Ayuda: Ponga z = cos(θ) + i sin(θ) y consi<strong>de</strong>re la integral como una integral <strong>de</strong><br />

linea en la circunferencia |z| = 1. Use que sin(θ) = 1 1 1<br />

(z − ) y dθ = dz, apli-<br />

2i z iz<br />

cando luego el teorema <strong>de</strong> residuos.

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