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If the l x+ my=1 is a normal to the hype...

If the `l x+ my=1` is a normal to the hyperbola `(x^(2))/(a^(2))-(y^(2))/(b^(2))=1`, then shown that `(a^(2))/(l^(2))-(b^(2))/(m^(2))=(a^(2)+b^(2))^(2)`

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