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5.1 INTEGRALES DOBLES 5.2 INTEGRALES TRIPLES

5.1 INTEGRALES DOBLES 5.2 INTEGRALES TRIPLES

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MOISES VILLENA Integración Múltiple<br />

π<br />

3 2<br />

∫ ∫<br />

0 0<br />

π<br />

2<br />

0<br />

π<br />

2<br />

0<br />

π<br />

2<br />

0<br />

π<br />

2<br />

3<br />

2 2<br />

( ) ( )<br />

2 3<br />

2 2 8<br />

V = 4 ( 36 − 4x ) dx = 36 −4(<br />

3sent) 3costdt<br />

27 27<br />

Ejemplo 2<br />

8<br />

=<br />

27<br />

16<br />

=<br />

3<br />

∫<br />

∫<br />

∫<br />

3 ( 6cos t)( 3costdt)<br />

4 ( cos )<br />

t dt<br />

16 ⎛1+ cos 2t<br />

⎞<br />

= ⎜ ⎟ dt<br />

3 ⎝ 2 ⎠<br />

∫<br />

2<br />

( 1+ 2cos 2 + cos 2 )<br />

16<br />

t t<br />

=<br />

dt<br />

3 4<br />

0<br />

π<br />

2<br />

π<br />

2<br />

π<br />

2<br />

2<br />

⎡ ⎤<br />

4 ⎢ ( 1+ cos4t)<br />

⎥<br />

= ⎢ dt + 2cos2tdt<br />

+<br />

dt⎥<br />

3⎢∫ ∫ ∫ 2 ⎥<br />

⎢ 0 0 0<br />

⎣ ⎥⎦<br />

4⎡ sen2t1 sen4t<br />

⎤<br />

= t+ 2 + t+<br />

3⎢ 2 2 8 ⎥<br />

⎣ ⎦<br />

4⎡3π⎤ =<br />

3<br />

⎢<br />

2 2<br />

⎥<br />

⎣ ⎦<br />

3<br />

V = π u<br />

Empleando integrales triples para calcular el volumen de la esfera que tiene por<br />

2 2 2 2<br />

ecuación x + y + z = a .<br />

Solución:<br />

Haciendo un gráfico<br />

Q<br />

x<br />

dz<br />

z<br />

dy<br />

dx<br />

π<br />

2<br />

2 2 2<br />

z = a −x − y<br />

a<br />

a z = 0<br />

0<br />

y<br />

197

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