What is the derivative of f(x) = cos(3x) - sin(2x) ?
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Math question: What is the smallest positive integer solution to the equation x^n + y^n = z^n, where n > 2, according to Fermat's Last Theorem?
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A plane takes off heading east at a speed of 400 mph for 2 hours. After that, it changes direction to north and travels 300 miles for 1.5 hours. What is the resultant displacement (magnitude and direction)?