st-line

Question: Angle between the lines $\frac{x}{a}+\frac{y}{b}=1$ and $\frac{x}{a}-\frac{y}{b}=1$ is

1) $2{{\tan }^{-1}}\frac{b}{a}$

2) ${{\tan }^{-1}}\frac{2ab}{{{a}^{2}}+{{b}^{2}}}$

3) ${{\tan }^{-1}}\frac{{{a}^{2}}-{{b}^{2}}}{{{a}^{2}}+{{b}^{2}}}$

4) None of these

Solution:

Explanation: No Explanation

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