Given the vector A, return B in which all numbers in A are doubling. So for:
A = [ 1 5 8 ]
B = [ 1 1 5 5 8 8 ]
Remove the polynomials that have positive real elements of their roots.
Back to basics 9 - Indexed References
03 - Matrix Variables 2
Solving a quadratic equation
Divisors of an integer
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