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Exercice 1.8 Galois Theory Ian Stewart
作者:
ortollj
主題:
等式
use the identity:cos(3(theta)=4(cos(theta))^3 - 3cos(theta) to solve the cubic equation t^3 + pt +q =0 with -27q^2 - 4p^3 >0 (3 real roots)
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a discussion about that on math forum
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