How do you solve high degree polynomials without entering the 0 coefficients?

[zeno333]

One can use the CAS PROOT function to solve a polynomial by entering a vector of it's coefficients, but doing that one must enter any 0 values ones also....(Like for x^30=1 for example...) How can one for example solve x^30=1 and get all 30 roots real and complex like in PROOT but without having to enter all of the many 0 coefficients???...Just solve for x^30=1 with no guesses needed like can be done in PROOT, only with no need to enter the 0 coefficients???