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A circular lamina of radius a and centre...

A circular lamina of radius `a` and centre `O` has a mass per unit area of `kx^(2)`, where `x` is the distance from `O` and `k` is a constant. If the mass of the lamina is `M`, find in terms of `M` and `a`, the moment of inertia of the lamina about an axis through `O` and perpendicular to the lamina.

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