Show that the lines \( (1-\cos \theta \tan \alpha) y^{2}-\left(2 \c...

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Show that the lines \( (1-\cos \theta \tan \alpha) y^{2}-\left(2 \cos \theta+\sin ^{2} \theta \tan \alpha\right) x y+\cos \theta(\cos \theta+\tan \alpha) x^{2}=0 \) include an angle \( \alpha \) between them.
\( \mathrm{P} \)
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