Math question: Find the derivative of f(x) = 3x^4 - 5x^2 + 2x - 1.
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Find the sum of the first 20 positive even integers using the sum formula.
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What is the rule for congruence of triangles that states 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?