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If the straight line lx+my+n=0 be a norm...

If the straight line `lx+my+n=0` be a normal to the hyperbola `(x^2)/(a^2)-(y^2)/(b^2)=1`, then by the application of calculus, prove that `(a^2)/(l^2)-(b^2)/(m^2)=((a^2+b^2)^2)/(n^2)`.

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CHHAYA PUBLICATION-QUESTION PAPER -2018-WBJEE
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