pair-st-lines

Question: The acute angle formed between the lines joining the origin to the points of intersection of the curves ${{x}^{2}}+{{y}^{2}}-2x-1=0$ and $x+y=1$, is



1) ${{\tan }^{-1}}\left( -\frac{1}{2} \right)$
2) ${{\tan }^{-1}}2$
3) ${{\tan }^{-1}}\frac{1}{2}$
4) ${{60}^{o}}$
Solution: Explanation: No Explanation
Angle between the pair of straight lines Condition for parallel and perpendicular lines

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