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ı
120
{\imath }^{120}
1
2
0
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−
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ln
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log
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)
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i^120
i^120
{i}^{120}
1
Use
Power Reduction Rule
:
i
n
=
i
n
mod
4
{i}^{n}={i}^{n\text{ mod }4}
i
n
=
i
n
mod
4
.
1
1
1
Done
1
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