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Question

Simplify. i11i^{11}

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i11i^{11}

We want to rewrite power in the form of 2n+k2n+k, where nn and kk are integers, such that kk is either 0 or 1.

Note that 11=10+1=25+111=10+1=2\cdot 5+1, therefore

i11=i25+1i^{11}=i^{2\cdot 5+1}

Recall that: am+n=aman\text{\color{#c34632}Recall that: $a^{m+n}=a^m\cdot a^n$}

i25+1=i25i1i^{2\cdot 5+1}=i^{2\cdot 5}\cdot i^1

Recall that: amn=(am)n\text{\color{#c34632}Recall that: $a^{m\cdot n}=(a^m)^n$}

i25i1=(i2)5i1i^{2\cdot 5}\cdot i^1=(i^{2})^{5}\cdot i^1

=(1)5i=(-1)^{5}\cdot i

Recall that: (1)n=1 if n is odd\text{\color{#c34632}Recall that: $(-1)^{n}=-1$ if $n$ is odd}

=1i=-1\cdot i

=i=-i

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