Question: In triangle ABC, the angle bisector of angle A intersects side BC at point D. If AD = 10 centimeters, BD = 6 centimeters, and DC = 8 centimeters, what is the length of side AC?
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Find the derivative of cos^3(x) + 2sin^2(x) - 3tan(x) at x = pi/4.
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Question: What is the median of the following data set? 7, 11, 15, 20, 23