Math question: What is the limit of (sin x - x) / (x² - sin x) as x approaches 0?
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Math question: The linear function f(x) = x represents the relationship between two variables. If the value of x is 5, what is the corresponding value of f(x)?
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What is the variance when calculating the population variance of a dataset: {2, 5, 7, 10, 12, 15}?