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Mathematics
Problem
Briefly justify why
1
+
(
d
y
d
x
)
2
≥
1
\sqrt{1+\left(\dfrac{dy}{dx}\right)^{2}}\ge 1
1
+
(
d
x
d
y
)
2
≥
1
for every
x
x
x
at which
f
f
f
is differentiable.
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