If the cuves, (x^(2))/(a)+(y^(2))/(b)=1 ...

If the cuves, `(x^(2))/(a)+(y^(2))/(b)=1 and (x^(2))/(c )+(y^(2))/(d)=1` intersect each other at an angle of `90^(@)`, then which of the following relations is TRUE?

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