Factor out .

Rewrite as .

Factor out .

Rewrite as .

Rewrite as .

Raise to the power of .

One to any power is one.

Multiply by .

Rewrite as .

Rewrite as .

Evaluate i^15

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# Evaluate i^15

Factor out .

Rewrite as .

Factor out .

Rewrite as .

Rewrite as .

Raise to the power of .

One to any power is one.

Multiply by .

Rewrite as .

Rewrite as .

Evaluate i^15