3. Determine if the argument is valid, that is, if the third statement is a valid deduction from the first two. Justify your answer using truth tables. Assume that f is a given function on R and a E R. In order for lim f(x) to exist, it is necessary that lim f(x) = lim f(x). However lim f (x) does not exist. Therefore lim f(x) # lim f(x). %3D エー→a+ エ→a- a エ→a+ エ→a-

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