In the calculation of roots_binomial a value of zeta is being
calculated using Euler's formulation and expanded(complex=True). Is
there a reason to do the expanding and is there a reason not to use
the more compact "roots of -1" formulation?
Also, after computing the root an expand(power_base=False) is done
If the (-1) formulation and no expanding is done, a much more compact
(and faster) result is attained. Is that expanding necessary?
compare
h[2] >>> solve((x-1)**3 - 3)
[1 - (-3)**(1/3), 1 + I*(-3)**(1/3)*3**(1/2)/2 + (-3)**(1/3)/2,
1 - I*(-3)**(1/3)*3**(1/2)/2 + (-3)**(1/3)/2]
to the unexpanded Euler representation:
[1 + 3**(1/3), 1 + 3**(1/3)*exp(2*pi*I/3), 1 + 3**(1/3)*exp(4*pi*I/
3)]
or the "roots of -1" representation
[1 + 3**(1/3), 1 + (-1)**(2/3)*3**(1/3), 1 - (-3)**(1/3)]
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