Math question: What is the value of cos(π/4) - sin(π/3)?
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Math question: Using Heron's Formula, find the area of a triangle with side lengths 5 cm, 12 cm, and 13 cm.
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Question: In a data set of 10 numbers, the mean is 15, the mode is 12, the median is 14, and the range is 25. What is the average of the first five numbers?