Math Question: Find the 4th order derivative of f(x) = cos(3x) - sin(5x), with respect to x.
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Find the roots of the cubic equation x^3 + 2x^2 - 7x - 6 = 0.
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What is the mixed number representation of the improper fraction 7/2? How can this fraction be factored? And what are the real numbers that satisfy the inequality x^2 - 5x + 6 > 0?