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{{Short description|A rigid body with 3 distinct axes of inertia is unstable rotating about the middle axis}}
{{pp|small=yes}}
{{Technical|date=November 2024}}
[[File:tennis_racquet_principal_axes.svg|thumb|Principal axes of a tennis racket.]]
[[File:tennis_racket_theorem.gif|thumb|upright=1.5|link={{filepath:tennis_racket_theorem.ogv}}|Composite video of a tennis racquet rotated around the three axes – the intermediate one flips from the light edge to the dark edge]]
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