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The explicit formula, which expresses the Alexander polynomials\Delta_{n,3}(t) of torus knots T(n,3) as a sum of the Alexander polynomials\Delta_{k,2}(t) of torus knots T(k,2), is found. Using this result and thosefrom our previous papers, we express the Alexander polynomials \Delta_{n,3}(t)through Chebyshev polynomials. The latter result is extended to general torusknots T(n,l) with n and l coprime.

Alexander Polynomial Invariants of Torus Knots T(n,3) and Chebyshev Polynomials