Factor out .

Rewrite as .

Rewrite as .

Rewrite as .

Raise to the power of .

One to any power is one.

Multiply by .

Simplify i^81

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# Simplify i^81

Factor out .

Rewrite as .

Rewrite as .

Rewrite as .

Raise to the power of .

One to any power is one.

Multiply by .

Simplify i^81