1.

. The angle between the lines represented by the equation \[a{{x}^{2}}+xy+b{{y}^{2}}=0\] will be \[{{45}^{o}}\], if

A.   \[a=1,b=6\]        
B.   \[a=1,b=-6\]
C.   \[a=6,b=1\]        
D.   None of these
Answer» C.   \[a=6,b=1\]        


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