Question

Solve
${i}^{91}$
Complex number class 11

Answer 1

Hey your answer ^_^
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$= {i}^{91} \\ \\ = {( {i}^{2}) }^{45} .i \\ \\ ( {i}^{2} = - 1) \\ \\ = {( - 1)}^{45} .i \\ \\ - i$

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#hope its help
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Answer 2

the above answer is correct