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α =<br />

<br />

= 2<br />

3 π.<br />

<br />

2π<br />

0<br />

cos θ sin θ dθ = 1<br />

2<br />

2π<br />

0<br />

cos 3 θ dθ =<br />

=<br />

=<br />

2π<br />

0<br />

3π/2<br />

−π/2<br />

π/2<br />

−π/2<br />

1<br />

−1<br />

sin(2θ) dθ = 1<br />

4<br />

cos 3 θ dθ =<br />

4π<br />

0<br />

3π/2<br />

−π/2<br />

(1 − sin 2 θ) cos θ dθ +<br />

(1 − w 2 ) dw +<br />

−1<br />

1<br />

sin w dw = 0.<br />

(1 − sin 2 θ) cos θ dθ<br />

3/2π<br />

π/2<br />

(1 − w 2 ) dw = 0.<br />

(1 − sin 2 θ) cos θ dθ<br />

x = 0 γ(y) = y 2 (1 − y 2 ) + 1 t ∈ [0, α] <br />

<br />

(1 + √ 5)/2 S γ z <br />

(0, 0, 1) <br />

F : R 3 → R 3<br />

F (x, y, z) = (e 4y , x − x 2 , z).<br />

F <br />

γ<br />

S 2<br />

<br />

F S<br />

F ˜γ <br />

F <br />

z = 0 <br />

F = (F1, F2, F3)<br />

<br />

div F (x, y, z) = ∂xF1 + ∂yF2 + ∂zF3 = 1,<br />

rot ⎛<br />

F = det ⎝ e1 ∂x e4y e2 ∂y x − x2 ⎞<br />

⎠ = (0, 0, 1 − 2x − 4e<br />

e3 ∂z z<br />

4y ).<br />

γ(0) = 1 γ(α) = 0 <br />

˙γ(y) = 2y(1 − y 2 ) + y 2 (−2y) = 2y − 4y 3 = 2y(1 − 2y 2 ),<br />

y ∈ [0, α] y = 0 y = <br />

√<br />

2<br />

0 < y < 2 √ 2<br />

2 < y ≤ α 0<br />

1 √ 2/2 5/4 y = α <br />

0 ¨γ(y) = 2 − 12y2 0 < y < 1/ √ 6 <br />

1/ √ 6 < y < α<br />

S <br />

ϕ(ρ, θ) = (ρ cos θ, ρ sin θ, ρ 2 (1 − ρ 2 ) + 1),<br />

<br />

⎛<br />

cos θ<br />

Jac ϕ(ρ, θ) = ⎝ sin θ<br />

ρ sin θ<br />

ρ cos θ<br />

2ρ − 4ρ3 ⎞<br />

⎠ .<br />

0<br />

√ 2<br />

2

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