A) \[1,\,1,i,-i\]
B) \[1,\,-1,i,-i\]
C) \[1,-1,\omega ,{{\omega }^{2}}\]
D) None of these
Correct Answer: B
Solution :
Given equation \[{{x}^{4}}-1=0\] Þ \[({{x}^{2}}-1)({{x}^{2}}+1)=0\] Þ \[{{x}^{2}}=1\]and \[{{x}^{2}}=-1\] Þ \[x=\pm 1,\pm i\]
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