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OpenStudy (fibonaccichick666):
Assistance please! \[prove: \sum _{d|n}[\mu(d)\phi(d)]=\prod _{p|n}[2-p]\]
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OpenStudy (fibonaccichick666):
\[prove: \sum _{d|n}[\mu(d)\phi(d)]=\prod _{p|n}[2-p]\]
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