kni 2. Let R = {e:ke 0,1,2,3} where el = cos® + i sin 0. Consider the set R under complex multiplication. a. Determine the elements of R. b. How many elements does R have? c. Simplify: elnoe'mo where n and m are integers d. Is R closed under complex multiplication? e. What is the identity element in R under the given operation? White "none", if it does not exist. f. Determine the inverse element of each element in R (if these inverse elements exist). g. Is R a group under the given operation? Why? Is it Abelian?

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