Math question: Find the limit of (cos(x) - 1) / (x^2) as x approaches 0.
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What is the value of f(x) when x = 10 in the logarithmic function f(x) = log(x), and what is the value of f(x) when x = e in the natural logarithmic function f(x) = ln(x)?
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Math Question: Solve the cubic equation x^3 + 4x^2 - 5x - 6 = 0.