Write a procedure that says whether or not an item a is in a  list L, and at which place (if there are several times the same item, you can return the place of the first, or the list of places of all the occurrences of a).

i want to prove that :int(2*(sin(theta)/cos(theta))^2*p-1,theta=0..Pi/2)=Pi/sin(p*Pi), can anyone help me ?

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Calculate S (100) by constructing a procedure "CalculesS" based on two iterative loops for, as

can anyone one tell me the meaning of builtin with examples?

A:={4,5,6,-9};
                          A := {4, 5, 6, -9}

E:={a,a,-2,4,-6};
                         E := {-2, 4, -6, a}

how does maple treat sets , and  what is the diffrence between sets and lists ?