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If two curves ax^2 +by^2=1 and a'x^2+b'y...

If two curves `ax^2 +by^2=1` and `a'x^2+b'y^2=1` intersect orthogonally,then show that `1/a-1/b=1/[a']-1/[b']`

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CENGAGE-APPLICATION OF DERIVATIVES-Solved Examples And Exercises
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