Math question: Find the dot product of vector A = [3, -2, 1] and vector B = [4, 5, 2].
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Math question: Find the 3rd derivative of f(x) = sin(x) + e^x - ln(x), where f(x) is a function that involves trigonometric, exponential, and logarithmic functions.
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Math question: Calculate the length of the hypotenuse in a right triangle with legs measuring 10 units and 15 units.