Electronis Discussion

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Which one of the following options correctly describes the locations of the roots of the equation $s^{4}+s^{2}+1=0$ on the complex plane?

- Four left half plane(LHP) roots
- One right half plane(RHP) root,one LHP root and two roots on the imaginary axis
- Two RHP roots and two LHP roots
- All four roots are on the imaginary axis

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