Math question: What is the derivative of f(x) = sin(x) + cos(x) - tan(x)?
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Math question: The sides of a triangle measure 12 cm, 9 cm, and 15 cm. Using Heron's Formula, find the area of the triangle.
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What are the characteristics of the parabolic function 𝑦 = 2𝑥²? Discuss its vertex, axis of symmetry, direction of opening, and whether it has a maximum or minimum value.