Math question: Find the limit as x approaches infinity of (3x^2 + 2x - 5)/(4x^3 - 6x + 1).
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Math question: Find the derivative of f(x) = 2sin(3x) + cos(4x) with respect to x using the chain rule.
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What is the general equation of an ellipse centered at (h, k), with semi-major axis a, semi-minor axis b, and the foci located at (h ± c, k), where c = ā(a^2 - b^2)?