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Find the acute angle, \theta between the lines 2 x+y-6=0 and 3 x-2 y+2=0.
\theta =\tan ^{-1}\left (\frac {7}{4}\right )
\theta =\tan ^{-1}\left (-\frac {7}{4}\right )
\theta =\tan \left (\frac {7}{4}\right )
None of the other four choices.
\theta =\tan ^{-1}\left (\frac {4}{7}\right )
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