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A couple things to complete the (exact) answer of Sebastien

  • sqrt(1/z) will give you ONE solution of the equation t^2==1/(1+I). There are two :

    sage: solve(t^2==1/(1+I),t)

    [t == -sqrt(-1/2I + 1/2), t == sqrt(-1/2I + 1/2)]

  • You may have a better grasp of the meaning of the answer(s) by asking maxima.polarform(sqrt(1/z)) and maxima.polarform(1/sqrt(z)) respectively :

    sage: maxima.polarform(sqrt(1/z))


    sage: maxima.polarform(1/sqrt(z))