Graphics Reference
In-Depth Information
Thus, the tangential vector is
2t
i
+
4
j
+
4t
−
4
k
Its magnitude is
=
2t
2
d
r
dt
4
2
+
16
+
4t
−
and the unit tangential vector is
2t
i
+
4
j
+
4t
−
4
k
t
=
2t
2
4
2
+
+
−
16
4t
If we wanted to know the value of
t
when t
=
1, then we would find
2
i
+
4
j
2
√
20
i
4
√
20
j
t
=
√
4
16
=
+
+
1
√
5
i
2
√
5
j
t
=
+
