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Mathematics
Mathematics
Problem
Find the length of the curve.
r
(
t
)
=
cos
t
i
+
sin
t
j
+
ln
cos
t
k
,
0
≤
t
≤
π
/
4
\mathbf{r}(t) = \cos t\mathbf{i} + \sin t\mathbf{j} + \ln \cos t\mathbf{k}, \quad 0 \le t \le \pi/4
r
(
t
)
=
cos
t
i
+
sin
t
j
+
ln
cos
t
k
,
0
≤
t
≤
π
/4
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