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Q. In triangle XYZ, $\angle $XZY= 90$\xb0$, XY = z units, YZ = x units, ZX = y units. ZD is perpendicular to XY and ZD = p units. Prove that : $\frac{1}{{p}^{2}}=\frac{1}{{x}^{2}}+\frac{1}{{y}^{2}}$

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