Question

"1. AB, CD, PQ are perpendicular to BD. AB \\( \\left. = x , C D = y \\text { and } P Q = z \\text { then prove that } \\frac { 1 } { x } + \\frac { 1 } { y } = \\frac { 1 } { z } \\text { (R.P } \\right) \\)\n\\( \\left. \\begin{array} { r l } { } & { \\text { ( } } \\\\ { x } & { \\text { Pre } } \\\\ { b } & { d ^ { 2 } } \\end{array} \\right] \\)"

Answer 1