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De Moivre and Euler question (1 Viewer)

ISAM77

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Anyone else find this topic very tedious and frustrating? Anyway, I’m tired and can’t find how to solve q11. d). Could anyone help out pls
 

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liamkk112

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Anyone else find this topic very tedious and frustrating? Anyway, I’m tired and can’t find how to solve q11. d). Could anyone help out pls
should be sum of roots related to the eqn x^2 + ax + b = 0 from a first glance
 

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