Question

If fy exists in a certain neighbourhood of a point (a, b) and fyx is continuous at
(a, b), then by Schwarz's theorem fxy (a, b) exists and
(A) (a,b) =-fyz(a,b)
(B) fv(a,b) = fyr (a, b)
(C) Iv(a,b) + fyx (a,b)
(D) None of these​

Answer 1

Answer:

(B) fv(a,b) =fyr (a,b)