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Mean Value of a Function Sketched

Sketch the graph of y = cos x in the range -pi<x<pi. Hence, sketch the graph of y=|cos x| in the same range.
Find the mean value of y=|cos x| in the range -pi<x<pi.

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The meanvalue of a trigonometric function is found. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.

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