A foil is to be put as shield over a cake (circular) in a shape such that the heat is even along any diameter of the cake?

f(x, y) = sin(y‚Äö√Ñ√∂‚àö√ñ‚àö√´x)x2 + xy

A foil is to be put as shield over a cake (circular) in a shape such t

1.	A foil is to be put as shield over a cake (circular) in a shape such that the heat is even along any diameter of the cake?
A.
B.	f(x, y) = sin(y‚Äö√Ñ√∂‚àö√ñ‚àö√´x)x<sup>2</sup> + xy
C.	f(x, y) = x<sup>2</sup> + y<sup>3</sup>
Answer» C. f(x, y) = x<sup>2</sup> + y<sup>3</sup>