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F D z = 0 <br />

(0, 0, ±1) <br />

<br />

rot <br />

F · ˆn dσ = (1 − 2x − 4e 4y ) dxdy,<br />

<br />

<br />

F dγ1 =<br />

D<br />

˜γ<br />

D<br />

D<br />

(1 − 2x − 4e 4y ) dxdy,<br />

˜γ D <br />

D := {(x, y, 0) :<br />

|x| ≤ 1, |y| ≤ 1} ˆn = (0, 0, 1) <br />

<br />

rot <br />

F · ˆn dσ = (1 − 2x − 4e 4y ) dxdy<br />

D<br />

D<br />

= Area(D) −<br />

1<br />

= 4 − 2<br />

−1<br />

<br />

e4y = 4 − 8<br />

4<br />

1 1<br />

−1<br />

2x dx − 2<br />

y=1<br />

y=−1<br />

(2x + 4e 4y ) dxdy<br />

−1<br />

1<br />

−1<br />

4e 4y dy<br />

= 4 − 2(e − e −1 ) = 0<br />

D <br />

x y z = 0 2 <br />

4 − 2(e − e −1 ) <br />

1<br />

<br />

ω(x, y) = (3x 2 y − y 2 ) dx + (x 3 − 2xy + 1) dy<br />

<br />

<br />

ω(x, y) = [sin(x + y) + x cos(x + y)] dx + x cos(x + y) dy<br />

<br />

<br />

ω(x, y) =<br />

y 2<br />

x2x2 dx −<br />

+ y2 y<br />

x x2 dy<br />

+ y2 x > 0 (1, 1)<br />

0<br />

<br />

<br />

ω(x, y) = y log y<br />

<br />

− 1 dx + x log<br />

x y<br />

<br />

+ 1 dy<br />

x<br />

<br />

y 2 dx + 2xy dy<br />

ω <br />

A = (1, 1)<br />

y = x x ∈ [0, 1]<br />

y = x 2 x ∈ [0, 1]<br />

y = √ x x ∈ [0, 1]<br />

y = 2x 3 − x x ∈ [0, 1]

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