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Posted on Jun 29, 2024

Let x = c o s ( 2 / 7 ) Prove the following: let z 7 = 1 where z is the complex number,

Letx=cos(2/7)

Prove the following: letz7=1 where z is the complex number, thenx=2z+z1

i.e. x is the 7th root of the unity.

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