Teaching DSSSB TGT Mock Test 2025 Mathematical Science Analysis Functions of Several Variables

if f(x, y) = xy then 

1
fy(e, 0) ≠ 1
2
fy(e, 0) = 1
3
fxy(1, 0) ≠  1
4
f yx​(1, 1) ≠ 1
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