Math question: Find the derivative of f(x) = cos(x) - sin(x) in terms of x.
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Question: The graph of a quadratic function opens upward and passes through (1, 4). If the vertex is located at (2, -3), find the equation of this quadratic function.
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What is the median of a dataset with an odd number of values: 5, 10, 15, 20, 25?