Angle between the lines \[\frac{x}{a}+\frac{y}{b}=1\] and \[\frac{x}{a}-\frac{y}{b}=1\] is [MP PET 1995]

\[{{\tan }^{-1}}\frac{2ab}{{{a}^{2}}+{{b}^{2}}}\]

\[{{\tan }^{-1}}\frac{{{a}^{2}}-{{b}^{2}}}{{{a}^{2}}+{{b}^{2}}}\]

Angle between the lines \[\frac{x}{a}+\frac{y}{b}=1\] and \[\frac{x}{a

1.	Angle between the lines \[\frac{x}{a}+\frac{y}{b}=1\] and \[\frac{x}{a}-\frac{y}{b}=1\] is [MP PET 1995]
A.	\[2{{\tan }^{-1}}\frac{b}{a}\]
B.	\[{{\tan }^{-1}}\frac{2ab}{{{a}^{2}}+{{b}^{2}}}\]
C.	\[{{\tan }^{-1}}\frac{{{a}^{2}}-{{b}^{2}}}{{{a}^{2}}+{{b}^{2}}}\]
D.	None of these
Answer» B. \[{{\tan }^{-1}}\frac{2ab}{{{a}^{2}}+{{b}^{2}}}\]

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Angle between the lines \[\frac{x}{a}+\frac{y}{b}=1\] and \[\frac{x}{a}-\frac{y}{b}=1\] is [MP PET 1995]

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