pair-st-lines

Question: The angle between the pair of lines $2{{x}^{2}}+5xy+2{{y}^{2}}+3x+3y+1=0$ is



1) ${{\cos }^{-1}}\left( \frac{4}{5} \right)$
2) ${{\tan }^{-1}}\left( \frac{4}{5} \right)$
3) $0$
4) $\pi /2$
Solution: Explanation: No Explanation
Angle between the pair of straight lines Condition for parallel and perpendicular lines

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