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Mathematics
Problem
Simplify when possible. The answers are in Chapter 23, starting on page 464. 19. Find
d
y
d
x
\frac{d y}{d x}
d
x
d
y
at
x
=
1
x=1
x
=
1
if
y
=
1
+
u
1
+
u
2
y=\frac{1+u}{1+u^{2}}
y
=
1
+
u
2
1
+
u
and
u
=
x
2
−
1
u=x^{2}-1
u
=
x
2
−
1
.
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