Write the following sets in roster form:

E = The set of all letters in the word TRIGONOMETRY

There are 12 letters in the word TRIGONOMETRY out of which T, R and O are repeating

So the element of the set are T, R, I, G,O, N, M, E and Y

The set in the roaster form is

E = {T, R, I, G,O, N, M, E, Y}