for the question: Assume that R and S are relations on a set A. Prove

(using relation-algebraic calculations) or disprove (by providing

counterexamples) each of the following statements.

a) If R and S are both reflexive, then R ∪ S is reflexive, too.

how would i start to answer this question its the syntax of the answer iam having trouble with

This is what i have R U S = R Subset of S = A<=>A subset of S = Id A subset of S therefore reflexive