how to obtain the sequence of sin(((Kπ)/4)), where the integer K  is varying from 1 to 8, and then to delete the zeros.

i'm triying to solve this sytem ,

solve({x^2+y^2=3,x^2+2*y^2=3},{x,y});
{y = 0, x = RootOf(_Z^2-3)}
what is the meaning of RootOf

maple gives me this, can anyone explain to me,the signification of the solutions ?

Write a command maple to count each two elements distincts of a list L ?

to get the list where all the elements of a list L equal to its largest element are replaced by 0 ?

0^0 gives error ,0^0 is undefined, why  maple gives this result?