[Tex/LaTex] Cross partial derivatives with LaTeX equations I'm trying to write something simple: Not quite sure how to write out the second term (from the left) in LaTeX. Any suggestions please? Best Answer \documentclass{article} \begin{document} \[ \frac{\partial^2 f}{\partial y \, \partial x} = \frac{\partial}{\partial y} \biggl( \frac{\partial f}{\partial x} \biggr) % = \frac{\partial}{\partial y} \left( \frac{\partial f}{\partial x} \right) = (f_x)_y = f_{xy} = \partial_{yx} f \] \end{document} There is a difference in the spacing between using a \biggl(...\biggr) and \left(...\right) pair. Your choice, although the former is preferred. Related Question[Tex/LaTex] Show the Steps Taken to Solve an Equation[Tex/LaTex] How to show work on binary number addition/conversion[Tex/LaTex] How to left-align using eqnarray in latex[Tex/LaTex] Highlight and use arrows in an equation In a robust manner

## Best Answer

There is a difference in the spacing between using a

`\biggl(`

...`\biggr)`

and`\left(`

...`\right)`

pair. Your choice, although the former is preferred.