Math question: Given triangle ABC, where angle BAC measures 60 degrees, and the angle bisector of angle BAC intersects side BC at point D. If side AB measures 8 units, find the length of BD.
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Question: Find the derivative of y = sin^2(x) - 2cos(x) + tan(x) at x = π/4. (
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Question: What is the period of the trigonometric function f(x) = 3cos(2x) + sin(x)?