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Mathematics
Mathematics
Problem
For the curve defined by
x
2
+
x
y
−
y
2
=
1
x^{2}+xy-y^{2}=1
x
2
+
x
y
−
y
2
=
1
, evaluate
d
2
y
d
x
2
\displaystyle \frac{d^{2}y}{dx^{2}}
d
x
2
d
2
y
at the point
(
1
,
1
)
(1,1)
(
1
,
1
)
. a)
10
10
10
b)
−
5
-5
−
5
c)
−
10
-10
−
10
d)
5
5
5
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