conjugate
(also denoted z) is equal to x−yi. As a point in the complex plane 
represents the mirror image of z in the real axis. The complex conjugate satisfies,
and so complex conjugation is a field automorphism of ℂ. Other identities include
It is an important fact that if the complex number α is a root of a polynomial equation
where a1,…, an are real, then 
is also a root of this equation.
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- Taylor series
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