Factorising complex numbers how did he get from ....(1) to ....(2) how did he get factorisation $z^4-z^3+z^2-z+1$ from trig factorsiation
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3Statement (2) is does not follow from anything preceding: it’s an algebraic identity. Here in the States, it’s usually taught in the high-schools. – Lubin Oct 10 '18 at 02:05
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1See :https://math.stackexchange.com/questions/712758/derivation-of-factorization-of-an-bn – Vegeta the Prince of Saiyans Oct 10 '18 at 02:09
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See https://math.stackexchange.com/questions/480102/quadratic-substitution-question-applying-substitution-p-x-frac1x-to-2x4x – lab bhattacharjee Oct 10 '18 at 05:00