Solución
v
(
t
)
=
⟨
−
s
e
n
t
,
2
c
o
s
t
,
0
⟩
\bold{v}(t)=\lang −sent,2cost,0\rang
v
(
t
)
=
⟨
−
se
n
t
,
2
cos
t
,
0
⟩