Math Question: Given triangle ABC with sides AB = 5cm, BC = 6cm, and AC = 7cm, find another triangle DEF with sides DE = 7cm, EF = 5cm, and FD = 6cm. Are triangles ABC and DEF equal?
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What is the range of the cosine function f(x) = cos(x)?
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What is the length of the perpendicular bisector segment of a triangle if the base is 10 units long?