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L = ∫
a
b
[1+f'
2
(x)]
1/2
dx = lim
n→∞
∑
i=1
n
[Δx
i
2
+Δf
i
2
]
1/2
n:
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Limits x→±
∞
Limits x→
a
Continuity
Derivability
Differentiable function
Integrable function
Definite integral
X-rotation volume
Y-rotation volume
Curve length