Question: How to write a summation (Leibniz rule) in expanded form?

Hi to everybody, I'm computing these polinomials:

restart;
 pol:=(-1)^n/(2^n*n!)*(1 - x)^(-a) * (1 + x)^(-b) *diff((1 - x)^(a+n)* (1 + x)^(b+n),x$n);
 Lx:=unapply(pol,n,a,b);
 theta1(2) := Lx(2,0,0);

 

How can i expand the summation? i would like to have something like that:


evalf(theta1(2));
simplify(%);

but i don't want to evaluate it numerically!! i tried with eval or evala but i was not able to get the result i want! I would like to have an algebric polinomials without floating!

thanks  a lot

alberto

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