f:[0,pi]---R be defined by by considering the lower sum for the partition P={0,pi/6,5pi/6,pi},prove that , , , How do i find for each of the above interval. Thanks
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f is increasing on and decreasing on . On the former, pick the leftmost points. On the later, pick the rightmost points. It doesn't matter on the middle intrval, since its symmetric about the maximum.
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