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A circle is inscribed ti.e. touches all ...

A circle is inscribed ti.e. touches all four sides ) into a rhombous ABCD with one angle 60°. The distance from the centre of the circle to the nearest vertex is equal to 1. If P is any point of the circle then `|PA|^2+|PB|^2+|PC|^2+|PD|^2` is equal to:

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