# Chain rule for partial derivatives

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• January 29th 2010, 03:29 AM
Swlabr
Chain rule for partial derivatives
How would I evaluate $\frac{\partial^2 (f \circ g)}{\partial x_i \partial x_j}$?

If $i=j$ then it's fine, I would just use second order normal chain rule, but what would I do here?

Thanks.