Write Functions in ML to do the following:

- Return the third element of a list of length size 3.

- Given a list, return the list with the 2nd element deleted.

-Given 3 integers, produce a pair consisting of the smallest and largest using nested if.

- Duplicate each element of a list. Ex: 1,2,3 --> 1,1,2,2,3,3

- We use lists of reals to represent polynomials by their coefficients, lowest degree first. Implement a function that multiplies two polynomials.