Question:
If the curves, $\frac{x^{2}}{a}+\frac{y^{2}}{b}=1$ and $\frac{x^{2}}{c}+\frac{y^{2}}{d}=1$
intersect each other at an angle of $90^{\circ}$, then which of the following relations is TRUE?
Correct Option: , 2
Solution:
For orthogonal curves $a-c=b-d$
$\Rightarrow a-b=c-d$