Prove that m(r) ¤ IÏ(r) ¤ M(r), where m(r) and M(r) are the minimum and maximum values

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Prove that m(r) ‰¤ IÏ•(r) ‰¤ M(r), where m(r) and M(r) are the minimum and maximum values of Ï• on Cr . Then use the continuity of ( to prove that
Prove that m(r) ‰¤ IÏ•(r) ‰¤ M(r), where m(r) and
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