Find the condition that line lx + my - n...

Find the condition that line `lx + my - n = 0 ` will be a normal to the hyperbola `x^(2)/a^(2) - y^(2)/b^(2) = 1` .

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The correct Answer is:

`a^(2)/l^(2) - b^(2)/m^(2) = ((a^(2) + b^(2))^(2))/n^(2) `

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