Show that two isometries induce the same linear mapping

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How can I show that two isometries $F_1,F_2 : M \to M$ which agree at point $p$ and induce the same linear mapping from $T_pM$ agree on a neighborhood on $p$?

I am happy about a hint or an idea of how to approach it would be much appreciated.

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Hint: Use that an isometry sends geodesics to geodesics, and check what happens to geodesics emanating from $p$.