Question: Find the sum of the first 20 terms of an arithmetic sequence where the first term is 5 and the common difference is 3. (Hint: Use the sum formula)
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What is the reciprocal of the sum of the rational functions f(x) = 1/(2x) + 1/(3x) - 1/(4x)?
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What is the value of f(x) if f(x) is a constant function with f(x) = c, where c is a real number?