The angle between the lines represented by the equation \[a{{x}^{2}}+2hxy+b{{y}^{2}}=0\]is given by [RPET 1995]

\[\tan \theta =\frac{2({{h}^{2}}-ab)}{\sqrt{a+b}}\]

\[\tan \theta =\frac{2({{h}^{2}}-ab)}{(a+b)}\]

\[\tan \theta =\frac{2\sqrt{{{h}^{2}}-ab}}{(a+b)}\]

\[\tan \theta =\frac{2\sqrt{{{h}^{2}}+ab}}{(a+b)}\]

The angle between the lines represented by the equation \[a{{x}^{2}}+2

1.	The angle between the lines represented by the equation \[a{{x}^{2}}+2hxy+b{{y}^{2}}=0\]is given by [RPET 1995]
A.	\[\tan \theta =\frac{2({{h}^{2}}-ab)}{(a+b)}\]
B.	\[\tan \theta =\frac{2\sqrt{{{h}^{2}}-ab}}{(a+b)}\]
C.	\[\tan \theta =\frac{2({{h}^{2}}-ab)}{\sqrt{a+b}}\]
D.	\[\tan \theta =\frac{2\sqrt{{{h}^{2}}+ab}}{(a+b)}\]
Answer» C. \[\tan \theta =\frac{2({{h}^{2}}-ab)}{\sqrt{a+b}}\]

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The angle between the lines represented by the equation \[a{{x}^{2}}+2hxy+b{{y}^{2}}=0\]is given by [RPET 1995]

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