Math question: Find the limit as x approaches a of (f(x) - g(x))/(h(x) - k(x)), where f(x), g(x), h(x), and k(x) are differentiable functions satisfying L'Hospital's Rule.
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Question: Find the unit vector and its components in the direction of vector v = (3, -4, 5).
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Math Question: Calculate the 4th derivative of f(x) = 3x^5 - 2x^3 + 7x^2 + 4x - 1.