Math question: Find the derivative of f(x) = sin(2x) - cos(3x) - tan(x) - sec(4x).
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What is the result of differentiating the composition g(f(x)) with respect to x using the chain rule?
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Question: In triangle ABC, the angle bisector of angle A divides side BC into segments BD = x and CD = 2x+3. If AB = 12 and AC = 18, find the value of x.