. If \[(a+3b)(3a+b)=4{{h}^{2}}\], then the angle between the lines represented by \[a{{x}^{2}}+2hxy+b{{y}^{2}}=0\] is

. If \[(a+3b)(3a+b)=4{{h}^{2}}\], then the angle between the lines rep

1.	. If \[(a+3b)(3a+b)=4{{h}^{2}}\], then the angle between the lines represented by \[a{{x}^{2}}+2hxy+b{{y}^{2}}=0\] is
A.	\[{{30}^{o}}\]
B.	\[{{45}^{o}}\]
C.	\[{{60}^{o}}\]
D.	\[{{\tan }^{-1}}\frac{1}{2}\]
Answer» D. \[{{\tan }^{-1}}\frac{1}{2}\]

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. If \[(a+3b)(3a+b)=4{{h}^{2}}\], then the angle between the lines represented by \[a{{x}^{2}}+2hxy+b{{y}^{2}}=0\] is

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