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Mathematics
Problem
If
y
=
1
a
−
z
y = \frac{1}{a-z}
y
=
a
−
z
1
, then
d
z
d
y
=
\frac{dz}{dy} =
d
y
d
z
=
(a)
(
z
−
a
)
2
(z-a)^2
(
z
−
a
)
2
(b)
−
(
z
−
a
)
2
-(z-a)^2
−
(
z
−
a
)
2
(c)
(
z
+
a
)
2
(z+a)^2
(
z
+
a
)
2
(d)
−
(
z
+
a
)
2
-(z+a)^2
−
(
z
+
a
)
2
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