If u=x^4, show that (del^3u)/(delx^2del...

If `u=x^4`, show that `(del^3u)/(delx^2dely)=(del^3u)/(delxdelydelx)`

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`u=x^4`
diff with respect to x
`u'=4x^3`
diff with respect to x
`u''=12x^2`
diff with respect to y
`u'''=0`
`du/dx=4x^3`
...

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