What is the length of the third side in a triangle, given sides of length a = 5 and b = 8?
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Math question: Find the derivative of f(x) = sin^2(x)cos^3(x) using the chain rule and product rule.
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Math Question: Given a triangle ABC where AD is the angle bisector of angle A, find the length of BD if AB = 12 cm, AC = 9 cm, and /_\BAC = 30 degrees.