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Let F (x) = StartFraction 3 x Over x squared minus 1 EndFraction Which expression represents f '(x)?

StartFraction 3 Over 2 x EndFraction
StartFraction 3 (x squared + 1) Over x squared minus 1) squared EndFraction
StartFraction negative 3 (x squared + 1) Over (x squared minus 1) squared EndFraction
StartFraction 3 (3 x squared minus 1) Over (x squared minus 1) squared EndFraction