A-Level
EDEXCEL
Mathematics & Further Mathematics
May 2018
QP-201805-Further Mathematics-UFP2 · Question 7
Question (excerpt):
24 7. (a) Use de Moivre’s theorem to show that cos7șŁ FRV7ș–112 cos5ș + 56 cos3ș – 7 cosș (6) (b) Hence find the four distinct roots of the equation 64x7 – 112x5 + 56x3 – 7x + 1 = 0 giving your …
24 7. (a) Use de Moivre’s theorem to show that cos7șŁ FRV7ș–112 cos5ș + 56 cos3ș – 7 cosș (6) (b) Hence find the four distinct roots of the equation 64x7 – 112x5 + 56x3 – 7x + 1 = 0 giving your …
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