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[" If "P(1),P(2)" and "P(3)" are the att...

[" If "P_(1),P_(2)" and "P_(3)" are the attudes of a triangle from vertices "A,B" and "C],[" area of the triangle,then the value of "(1)/(P_(1))+(1)/(P_(2))-(1)/(P_(3))=],[[" (A) "(2(S-C))/(Delta)," (B) "(S-C)/(2Delta)],[" (C) "(S-C)/(L)," (D) none of these "]]

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