1.

Ifp_1 , p_2 , p_3are the altitudes drawn from the vertices A,B, C of triangles respectivelyshow that(1)/( p_1) +(1)/(p_2)-(1)/( p_3)= ( 2ab cos ^(2)C//2) / ( Delta (a+b+ c) )

Answer»

` (1)/( r_3) `
` r_1+r_2`
` r_3`
` ( 1)/ (r_1 ) `

ANSWER :A


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