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Simplify powers of $i$ (#644)
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Simplify powers of $i$ (#644)
Use
i
2
=
−
1
i^2 = -1
i
2
=
−
1
,
i
3
=
−
i
i^3 = -i
i
3
=
−
i
,
i
4
=
1
i^4 = 1
i
4
=
1
, and cyclic pattern.
