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U(1, 1) = 2 ∂xU(x, y) = y/x+2 ∂yU(x, y) =<br />

x/y + 1<br />

<br />

<br />

<br />

<br />

<br />

1<br />

ay<br />

1<br />

ω = cos<br />

dx + cos<br />

(x − 1)y − 1 ((x − 1)y − 1) 2 (x − 1)y − 1<br />

Ω = {(x, y) : (x − 1)y < 1}<br />

Ω <br />

a ∈ R ω Ω<br />

a (0, 0) sin 1<br />

1 − x<br />

dy<br />

((x − 1)y − 1) 2<br />

ω = ωx dx + ωy dy<br />

Ω y = 1<br />

x−1 <br />

(1, 0) Ω <br />

Ω y Ω<br />

ω Ω ∂yωx = ∂xωy v =<br />

(x − 1)y − 1 <br />

∂yωx = ∂<br />

<br />

<br />

1<br />

ay<br />

cos<br />

∂y (x − 1)y − 1 ((x − 1)y − 1) 2<br />

<br />

= ∂<br />

<br />

1 ay<br />

cos<br />

∂v v v2 <br />

· ∂v<br />

<br />

∂ 1 ay<br />

+ cos<br />

∂y ∂y v v2 <br />

= ay(x − 1) ∂<br />

<br />

1 1<br />

cos<br />

∂v v v2 <br />

1 1<br />

+ a cos<br />

v v2 ∂xωy = ∂<br />

<br />

<br />

1<br />

1 − x<br />

cos<br />

∂x (x − 1)y − 1 ((x − 1)y − 1) 2<br />

<br />

= ∂<br />

<br />

1 1 − x<br />

cos<br />

∂v v v2 <br />

· ∂v<br />

<br />

∂ 1 1 − x<br />

+ cos<br />

∂x ∂x v v2 <br />

= (1 − x)y ∂<br />

<br />

1 1<br />

cos<br />

∂v v v2 <br />

1 1<br />

− cos<br />

v v2 a = −1<br />

v(x, y) = (x − 1)y − 1<br />

<br />

<br />

<br />

<br />

1<br />

−y<br />

1<br />

1 − x<br />

ω = cos<br />

dx + cos<br />

dy<br />

(x − 1)y − 1 ((x − 1)y − 1) 2 (x − 1)y − 1 ((x − 1)y − 1) 2<br />

<br />

<br />

1<br />

1<br />

= −<br />

· cos<br />

(ydx + (x − 1)dy)<br />

((x − 1)y − 1) 2 (x − 1)y − 1<br />

= d<br />

sin(1/v) · dv(x, y)<br />

dv<br />

ω = df(x, y) f(x, y) = sin(1/v(x, y)) = sin(1/((x−1)y −1)) f(0, 0) = sin 1<br />

f

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