A) \[\pm \text{ }6\]
B) \[\sqrt{6}\]
C) \[-\sqrt{6}\]
D) \[\pm \text{ }2\]
Correct Answer: D
Solution :
If it represents two coincident straight lines, then the condition \[{{h}^{2}}-ab=0\] should apply as angle between them would be zero. Hence \[{{h}^{2}}-4=0\]or\[h=\pm 2\].
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