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Mathematics
Problem
If
L
1
L
2
+
λ
L
2
L
3
+
μ
L
3
L
1
=
0
L_1L_2 + \lambda L_2L_3 + \mu L_3L_1 = 0
L
1
L
2
+
λ
L
2
L
3
+
μ
L
3
L
1
=
0
is such that
μ
=
0
\mu = 0
μ
=
0
and
λ
\lambda
λ
is non-zero, then it represents a. a parabola b. a pair of straight lines c. a circle d. an ellipse
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