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FilledSmallSquare FibonacciSimplify[expr, assum] tries to simplify combinations of symbolic Fibonacci numbers in expr using assumptions assum.

FilledSmallSquare Example: Developer`FibonacciSimplify[Fibonacci[n-1]+Fibonacci[n-2], Element[n, Integers]] LongRightArrow.

FilledSmallSquare FibonacciSimplify can typically perform transformations only when arguments of Fibonacci numbers are specified to be integers.

FilledSmallSquare FibonacciSimplify is automatically used inside FullSimplify and FunctionExpand.