H* FRANCESCA CAMPI *L
H* 1 *L
F@x_, y_D := 8x * y, x ^ 2 * y<
r@t_D := : 1 + t
2, t>
In[13]:=
f@t_D = F@x, yD . 8x ® r@tD@@1DD, y ® r@tD@@2DD<
fs@t_D = Dot@f@tD, r '@tDD
Out[13]=
:t 1 + t
2, t I1 + t
2M>
Out[14]=
t
2+ t I1 + t
2M
In[15]:=
Integrate@fs@tD, 8t, - 2, 2<D
Out[15]=
16
3
In[16]:=
H* 2 *L
F@x_, y_D := 82 x + 1, x * y<
In[30]:=
eq1 = x ^ 2 + y ^ 2 1;
eq2 = Sqrt@3D y == x + 1;
Solve@8eq1, eq2<, 8x, y<D
Out[32]=
:8x ® - 1, y ® 0<, :x ® 1 2
, y ® 3 2
>>
In[34]:=
r1@t_D := 8Cos@tD, Sin@tD<
r2@t_D := 8t, Ht + 1L Sqrt@3D<
In[40]:=
f1@t_D = F@x, yD . 8x ® r1@tD@@1DD, y ® r1@tD@@2DD<
f2@t_D = F@x, yD . 8x ® r2@tD@@1DD, y ® r2@tD@@2DD<
fs1@t_D = Dot@f1@tD, r1 '@tDD fs2@t_D = Dot@f2@tD, r2 '@tDD
Out[40]=
81 + 2 Cos@tD, Cos@tD Sin@tD<
Out[41]=
:1 + 2 t,
t H1 + tL 3
>
Out[42]=
Cos@tD
2Sin@tD - H1 + 2 Cos@tDL Sin@tD
Out[43]=
1 + 2 t + 1 3
t H1 + tL
In[48]:=
Integrate@fs1@tD, 8t, - Π, Π 3<D + Integrate@fs2@tD, 8t, 1 2, - 1<D
Out[48]=
- 3 8
2