1.

Acute angle between the lines represented by \[({{x}^{2}}+{{y}^{2}})\sqrt{3}=4xy\] is        [MP PET 1992]

A.   \[\pi /6\]     
B.   \[\pi /4\]
C.   \[\pi /3\]     
D.   None of these
Answer» B.   \[\pi /4\]


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