# Partial derivative please help

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• Nov 11th 2008, 08:53 PM
cowboys111
Partial derivative please help
Hi, im trying to find the partial dervative with respect to x of:
ln(sqrt(x^2+y^2+z^2)). Im really stuck, can someone please show me how you would work this out? Thank you.
• Nov 12th 2008, 12:56 AM
Peritus
$
\frac{\partial }
{{\partial x}}\frac{1}
{2}\ln \left( {x^2 + y^2 + z^2 } \right) = \frac{x}
{{x^2 + y^2 + z^2 }}$