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Integrais duplos e de linha

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24 <strong>Integrais</strong> Duplos<br />

(b) D = {y = x, y =5x, x =1}<br />

(c) D = {y = √ x, y =2 √ x, x =4}<br />

18. Passando aos coor<strong>de</strong>nadas polares calcule os seguintes integrais <strong>duplos</strong><br />

(a)<br />

(b)<br />

(c)<br />

(d)<br />

(e)<br />

(f)<br />

(g)<br />

Z1<br />

−1<br />

Z2<br />

0<br />

Z1<br />

0<br />

Z1<br />

1/2<br />

√<br />

1−y2 Z<br />

p<br />

x2 + y2dxdy 0<br />

√ 4−x 2<br />

Z<br />

0<br />

√ 1−x 2<br />

Z<br />

0<br />

√<br />

1−x2 Z<br />

0<br />

√<br />

1/2 1−x2 Z<br />

0<br />

Z1<br />

−1<br />

Z2<br />

0<br />

Z<br />

0<br />

√ 1−y 2<br />

Z<br />

− √ 1−y 2<br />

√ 4−y 2<br />

Z<br />

− √ 4−y 2<br />

p x 2 + y 2 dydx<br />

e x2 +y 2<br />

dydx<br />

¡ x 2 + y 2 ¢ 3/2 dydx<br />

xy p x 2 + y 2 dydx<br />

e −(x2 +y 2 ) dxdy<br />

x 2 y 2 dxdy<br />

19. Utilizando as coor<strong>de</strong>nadas polares, calcule os seguintes integrais <strong>duplos</strong>:<br />

(a) RR ¡<br />

D 3x +4y2 ¢ dxdy, on<strong>de</strong> D = © x2 + y2 ≥ 1,x2 + y2 ≤ 4,y ≥ 0 ª<br />

(b) RR<br />

D xdxdy, on<strong>de</strong> D = © x2 + y2 ≤ 25 ª<br />

(c) RR<br />

D ydxdy, on<strong>de</strong> D é a região do plano real limitada por x2 + y 2 =9,y=0<br />

e y = x.

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