Write a math question for the theme "Characteristics of constant function f(x)=c": Find the value of c if the constant function f(x)=c passes through the point (5, 9).
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Math Question: What is the derivative of f(x) = 3x^2 - 4x + 5 using the basic rules of derivatives?
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What is the range of the function y = 2sin(3x) - cos(x) in radians?