Use de Moivre's theorem to express cot 7 in terms of cot . (Use the equation cot
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Use de Moivre's theorem to express cot 7θ in terms of cot θ.
(Use the equation cot 7θ = 0 to show that the roots of the equation x6 - 21x4 + 35x2 - 7 = 0 are cot (1/14 kπ) for k = 1, 3, 5, 9, 11, 13 and deduce that
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Related Book For
Cambridge International AS & A Level Further Mathematics Coursebook
ISBN: 9781108403375
1st Edition
Authors: Lee Mckelvey, Martin Crozier
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