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Circles & Conics
hard
0:00.0
The line
y
=
x
+
k
y = x + k
y
=
x
+
k
is tangent to
x
2
=
4
y
x^2 = 4y
x
2
=
4
y
. Find
k
k
k
.
A
−
1
-1
−
1
B
0
0
0
C
1
1
1
D
2
2
2
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