Math question for finding the length of an angle bisector: Given a triangle ΔABC with angle C bisected by line segment AD, if AB = 8cm, AC = 12cm, and BD = 6cm, find the length of CD.
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What is the volume of a sphere with radius r? (V = (4/3)πr³)
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Question: What is the value of arctan(sqrt(3)) - arccos(1/2)?