The equation $x^2 - 3xy + 2y^2 + 3x - 5y + 2 = 0$ represents a pair of straight lines. If $\theta$ is the angle between them, then the value of $\cos \theta$ is equal to
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The angle between $ax^2 + 2hxy + by^2 + \dots = 0$ is solely determined by $a, h,$ and $b$.