# How to turn arbitrary function to polinomial series in Mathematica?

Can I turn any multivariate function into polinomial series in Mathematica?

Suppose I have a function

Fwd[x_, α_] := x (1/Sin[Pi x/2])^α


and wish to express it with a formula, consisting only of multiplications and summations. Is it possible?

If I apply

Normal[Series[Fwd[x, α], {x, 0, 3}, {α, 0, 3}]]


I get complex formula

which contains Log function. Why?

Fwd[x_,\[Alpha]_]:=x (1/Sin[Pi x/2])^\[Alpha] = x* Exp[\[Alpha]*Log[1/Sin[Pi x/2]]]