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Mathematics
Problem
If the curves
x
=
y
2
x = y^2
x
=
y
2
,
x
y
=
k
xy = k
x
y
=
k
cut orthogonally, then k is (a) 1 (b) -1 (c)
±
1
2
2
\pm \frac{1}{2\sqrt{2}}
±
2
2
1
(d)
±
1
2
\pm \frac{1}{\sqrt{2}}
±
2
1
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