PARI/gp

[Xorter]

Hi, again!
I need your help in PARI/gp. I would like to substitute a value into x of sin(x):

Code:

subst(sin(x),x,1)

But it returns with error. Why? Please, help me.

Code:

subst(Pol(sin(x)),x,1)

should work. But why not simply do

Code:

sin(1)

?

Oh, it was simplier than I thought. Thank you, my friend!
Well, because I have found a new type of integration and derivation. These are iterated! And I needed substitution in a function in my gp. Really amazing. I am going to share my results on this forum as soon as possibly.
(May be the key to determine what between addition and multiplication is.)
Just wait a few days, please.