If the angle between the two lines represented by \( 2 x^{2}+5 x y+...

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If the angle between the two lines represented by \( 2 x^{2}+5 x y+3 y^{2}+7 y+4=0 \) is \( \tan ^{-1}(m) \), then \( m \) is equal to
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(a) \( -\frac{1}{5} \)
(b) \( \frac{1}{5} \)
(c) \( -\frac{3}{5} \)
(d) \( \frac{3}{5} \)
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