Decompose
 Usage
• Decompose[poly, x] decomposes a polynomial, if possible, into a composition of simpler polynomials.
Notes
• Decompose gives a list of the polynomials  which can be composed as  to give the original polynomial. • The set of polynomials  is not necessarily unique. • Decomposition is an operation which is independent of polynomial factorization. • New in Version 1.
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