Question

If the curves

2 2

2 2 1

x y

a b

  and

2 2

2 2 1

x y

l m

  cut each other orthogonally then

1. 2 2 2 2 a b l m    2. 2 2 2 2 a b l m    3. 2 2 2 2 a b l m    4. 2 2 2 2 a b l m ​

Answer 1

sorry I'm not able understand this.