z=f(xy)

∂z/∂x∂z/∂y

0

1

f'(x)

f'(y)

f'(xy)

f'(x)f(y)

f(x)f'(y)

xf'(xy)

yf'(xy)

xyf'(xy)

none of the above

0

1

f'(x)

f'(y)

f'(xy)

f'(x)f(y)

f(x)f'(y)

xf'(xy)

yf'(xy)

xyf'(xy)

none of the above

Any ideas??