If \(\rm z = \cos \left( {\frac{x}{y}} \right) + \sin \left( {\frac{x}{y}} \right)\)then \(x\frac{{\partial z}}{{\partial x}} + y\frac{{\partial z}}{{\partial y}} = \)

If \(\rm z = \cos \left( {\frac{x}{y}} \right) + \sin \left( {\frac{x

1.	If \(\rm z = \cos \left( {\frac{x}{y}} \right) + \sin \left( {\frac{x}{y}} \right)\)then \(x\frac{{\partial z}}{{\partial x}} + y\frac{{\partial z}}{{\partial y}} = \)
A.	1
B.	cos x
C.	sin y
D.	0
Answer» E.

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