Question: Let z ( x , y ) = e x s i n y + e y c o s x , then find (

Let z(x,y)=exsiny+eycosx, then find
(i)del2zdelx2,
(ii)del2zdely2,
(iii)del2zdelx2+del2zdely2.
Let z ( x , y ) = e x s i n y + e y c o s x ,

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