The angle between the pair of lines \[2{{x}^{2}}+5xy+2{{y}^{2}}+3x+3y+1=0\] is [EAMCET 1994]

\[{{\tan }^{-1}}\left( \frac{4}{5} \right)\]

\[{{\cos }^{-1}}\left( \frac{4}{5} \right)\]

The angle between the pair of lines \[2{{x}^{2}}+5xy+2{{y}^{2}}+3x+3y+

1.	The angle between the pair of lines \[2{{x}^{2}}+5xy+2{{y}^{2}}+3x+3y+1=0\] is [EAMCET 1994]
A.	\[{{\cos }^{-1}}\left( \frac{4}{5} \right)\]
B.	\[{{\tan }^{-1}}\left( \frac{4}{5} \right)\]
C.	0
D.	p/2
Answer» B. \[{{\tan }^{-1}}\left( \frac{4}{5} \right)\]

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The angle between the pair of lines \[2{{x}^{2}}+5xy+2{{y}^{2}}+3x+3y+1=0\] is [EAMCET 1994]

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