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In a triangle ABC,r,r1,r2,r3, are the ra...

In a triangle `ABC,r,r_1,r_2,r_3`, are the radii of in circle and ex circles and `P_1, P_2, P_3`, are altitudes of triangle `ABC`.Then `1/P_1+1/P_2+1/P_3` is equal to

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