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If p1, p2, p3, be the altitudes of a tri...

If `p_1, p_2, p_3`, be the altitudes of a triangle ABC from the vertices A, B, C respectively and `Delta` be the area of the triangle ABC, prove that : `p/p_1 + 1/p_2 - 1/p_3 = (2ab cos^2, C/2)/(Delta (a+b+c))`

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