Math question: What is the limit as x approaches 2 of ((x^2 - 4)/(x - 2)) + ((2x + 1)/(x + 2))?
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Math question: Using the rule of congruence of triangles, if triangle ABC is congruent to triangle XYZ, what can we conclude about their corresponding angles and sides?
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What is the derivative of tanh(x) - sech(x) at x = 0?