https://github.com/fricas/fricas/commit/9b62873dfb986f9b5f909254f31a0f4fa2b05421.patch
fix symFunc to match its document
fix TANEXP which depends on symFunc
I didn't find a proof or a webpage containing the
algorithm/equation used by fricas, which I would
like to add such a link into comment.
The proof is not obvious, but if you compare
tanNa(x,8) and symFunc(x,8), you'll understand
the code:
(14) -> tanNa(x,8)
7 5 3
- 8x + 56x - 56x + 8x
(14) ───────────────────────────
8 6 4 2
x - 28x + 70x - 28x + 1
Type:
Fraction(Polynomial(Integer))
(15) -> symFunc(x,8)
2 3 4 5 6 7 8
(15) [8x,28x ,56x ,70x ,56x ,28x ,8x ,x ]
Type:
Vector(Polynomial(Integer))
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