Solución
T
(
t
)
=
−
12
13
s
e
n
(
4
t
)
i
+
12
13
c
o
s
(
4
t
)
j
+
5
13
k
\bold{T}(t)=−\frac{12}{13}sen(4t)\bold{i}+\frac{12}{13}cos(4t)\bold{j}+\frac{5}{13}\bold{k}
T
(
t
)
=
−
13
12
se
n
(
4
t
)
i
+
13
12
cos
(
4
t
)
j
+
13
5
k