Convert polynomial to symbolic expression

New to Julia
2

Please post code that works if it is copied and pasted.

using AbstractAlgebra, Symbolics

R, (x, y) = PolynomialRing(ZZ, ["x", "y"])

C = MPolyBuildCtx(R)
push_term!(C, ZZ(3), [1, 2]);
push_term!(C, ZZ(2), [1, 4]);

f = finish(C) # 2xy^4 + 3xy^2

exponents = f.exps
coeffic = f.coeffs

# Symbolics.jl expression 
symbolics_vars = Symbolics.variable.(f.parent.S) |> reverse
symb_f = sum(coeffic[i] * reduce(*, symbolics_vars.^(exponents[:, i])) for i in axes(exponents, 2))
# symb_f = 3y^2*x+2y^4*x

# work with symb_f  
Symbolics.gradient(sin(symb_f), symbolics_vars)
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