What is the length of side a in a triangle with side lengths b=9, c=12, and angle A=75 degrees?
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Math question: What is the equation of the quadratic function whose graph opens upward, with the vertex at (1, 2) and passing through the point (3, 5)?
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Math question: Find the 4th derivative of f(x) = 2x^3 - 5x^2 + 7x - 1.