Math question: Find the derivative of f(x) = 3x^5 - 2x^4 + 6x^3 - 8x^2 + 12x - 4.
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What congruence rule states that if two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the triangles are congruent?
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Math question: Calculate the standard deviation of a dataset: {12, 14, 16, 18, 20} using the formula.