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(d^2)/(dx^2)(1/(1+x^2))
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d
2
dx
2
(
1
1
+
x
2
)
=
−
2
(
−
3
x
2
+
1
)
(
1
+
x
2
)
3
Show Steps
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d
2
dx
2
(
1
1
+
x
2
)
=
−
2
(
−
3
x
2
+
1
)
(
1
+
x
2
)
3
steps
d
2
dx
2
(
1
1
+
x
2
)
show steps
d
dx
(
1
1
+
x
2
)
=
−
2
x
(
1
+
x
2
)
2
=
d
dx
(
−
2
x
(
1
+
x
2
)
2
)
show steps
d
dx
(
−
2
x
(
1
+
x
2
)
2
)
=
−
2
(
−
3
x
2
+
1
)
(
1
+
x
2
)
3
=
−
2
(
−
3
x
2
+
1
)
(
1
+
x
2
)
3
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