What is the limit of x^2/(e^x - 1) as x approaches 0?
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What is the integral of f(x) = 2x^3 - 3x^2 + 4x - 5?
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Math Question: In a right triangle, the adjacent side has a length of 5 units and the hypotenuse has a length of 13 units. Find the length of the opposite side.