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From a semi-circular disc of mass M and ...

From a semi-circular disc of mass `M` and radius `R_(2)`,a semi-circular disc of radius `R_(1)` is removed as shown in the figure. If the mass of original uncut disc is `M` ,then the moment of inertia of residual disc about an axis passing through centre `O` and perpendicular to the plane of the disc is

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