Find the degree of the differential equation satisfying the relation `sqrt(1+x^2)+sqrt(1+y^2)=lambda(xsqrt(1+y^2)-ysqrt(1+x^2))`

The degree of the differential equation satisfying the relation sqrt(1+x^(2))+sqrt(1+y^(2))=lambda(x sqrt(1+y^(2))-y sqrt(1+x^(2)))

The degree of the differential equation satisfying sqrt(1-x^(2))+sqrt(1-y^(2))=a(x-y) , is

The degree of the differential equation satisfying by the curves sqrt(1+x)-asqrt(1+y)=1, is ……..

The degree of the differential equation satisfying sqrt(1+x^(2))+sqrt(1+y^(2))=K(x sqrt(1+x^(2))-y sqrt(1+x^(2))) (1) 4(2)3(3)1(4)2