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2π<br />

0<br />

cos θ sin θ dθ = 1<br />

2<br />

2π<br />

0<br />

cos 3 θ dθ =<br />

=<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 />

y ′ + 1 1<br />

y =<br />

sin x y <br />

(1 − sin 2 θ) cos θ dθ<br />

R 2 \ {y = 0} <br />

z = y 1−(−1) = y 2 z ′ = 2yy ′ = 2 − 2z/ sin x <br />

<br />

<br />

ω(x, z) = p(x, z) dx + q(x, z) dz =<br />

<br />

2 − 2z<br />

<br />

dx − dz = 0<br />

sin x<br />

∂zp(x, z) − ∂xq(x, z) = − 2 2<br />

=<br />

sin x sin x q(x).<br />

2/ sin x sin x t =<br />

tan(x/2)<br />

<br />

dx 1 + t2 2 dt<br />

2 = 2<br />

= 2 log |tan(x/2)|<br />

sin x 2t 1 + t2 h(x, z) = tan2 (x/2) <br />

<br />

2 tan 2 z tan(x/2)<br />

(x/2) −<br />

cos2 <br />

dx − tan<br />

(x/2)<br />

2 (x/2)dz = 0<br />

<br />

V (x, z) = 4 tan(x/2) − 2x − z tan 2 (x/2),<br />

V (x, z) = c c ∈ R <br />

z sgn(tan(x/2))<br />

c + 2x − 4 tan(x/2)<br />

z(x) = −<br />

tan2 (x/2)<br />

y<br />

<br />

c + 2x − 4 tan(x/2)<br />

y(x) = ±<br />

.<br />

| tan(x/2)|<br />

<br />

<br />

˙x + 2x + 3y = 3e −2t ,<br />

˙y + 5x + y = 0.<br />

<br />

t = tan(x/2) cos x = 1−t 2<br />

1+t 2 sin x = 2t<br />

1+t 2 dx = 2dt<br />

1+t 2

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