Let's do this:
sage: R = PolynomialRing(AA,"x")
sage: x = R.gen()
sage: n=3

Then:
sage: chebyshev_T(n,x).parent()
Univariate Polynomial Ring in x over Algebraic Real Field

Ok. But:

sage: legendre_P(n,x).parent()
Symbolic Ring

why that ?

Yours,

t.

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