Y by amar_04, Adventure10
Suppose that
does not have a primitive root. Show that
for every
relatively prime
.

![\[a^{ \frac{\phi(m)}{2}}\equiv 1 \; \pmod{m}\]](http://latex.artofproblemsolving.com/2/6/2/2620c2417016be5577d64e981036675e67b35a56.png)


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