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32. SOLUTION OF TRIANGLES : In a triangle ABC, the angles A, B, C are in A.P. Show that :2cos [(A-C)/2] = (a+c)/sqrt(a²-ac+c²)

Answer» 32. SOLUTION OF TRIANGLES : In a triangle ABC, the angles A, B, C are in A.P. Show that :2cos [(A-C)/2] = (a+c)/sqrt(a²-ac+c²)


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