If u = x² + y², then ∂²u/∂x∂y is equal to?
- 0
- 1
- 2
- None of these
Explanation
u = x² + y²
First take ∂u/∂y = 0 + 2y = 2y
Now take ∂/∂x of 2y = 0, because 2y has no x
So ∂²u/∂x∂y = 0
Last verified on 05-06-2026
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