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Mathematics
Problem
Write a definite integral, in terms of
f
′
(
x
)
f'(x)
f
′
(
x
)
, that represents the exact length of the graph of a differentiable function
y
=
f
(
x
)
y=f(x)
y
=
f
(
x
)
on the interval
[
a
,
b
]
[a,b]
[
a
,
b
]
.
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