# Chapter 1 - Section 1.3 - Complex Numbers - 1.3 Exercises - Page 104: 85

$i$

#### Work Step by Step

Factor out as many $i^4$ as possible. $i^{25}=(i^4)^6*i$ Know that $i^4=1$. Substitute, and simplify. $(i^4)^6*i=1^6*i=i$

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