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Mathematics
Mathematics
Problem
Find the exact length of the curve
y
=
ln
(
cos
x
)
y=\ln(\cos x)
y
=
ln
(
cos
x
)
for
0
≤
x
≤
π
4
0\le x\le \dfrac{\pi}{4}
0
≤
x
≤
4
π
. a)
1
1
1
b)
2
+
1
\sqrt{2}+1
2
+
1
c)
ln
(
2
+
1
)
\ln(\sqrt{2}+1)
ln
(
2
+
1
)
d)
ln
2
\ln 2
ln
2
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