Choose all the direction in the plane where the function f(r,y) = cos I+y
has non zero changes at any (a,b).

Question

Choose all the direction in the plane where the function f(r,y) = cos I+y has non zero changes at any (a,b).​

Eva · Answer

Answer:   yes        mark me as Brainlist please

Choose all the direction in the plane where the function f(r,y) = cos I+yhas non zero changes at any (a,b).​