Math question: Given a triangle ABC with angle at vertex A bisected by line AD, and AD intersects side BC at point D. If AB = 10 units and AC = 12 units, find the length of BD.
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What is the limit as x approaches 0 of (3x^2 + 2x - 1)/(4x^2 + x)?
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Math question: What is the equation of the parabola that opens upwards, passes through the point (3, 4), and has a vertex at (-2, -1)?