GATE Electrical 2017 Set 2 | Question: 18

Question

Consider a function $f(x, y, z)$ given by

$f(x, y, z)=(x^{2}+y^{2}-2z^{2})(y^{2}+z^{2})$

The partial derivative of this function with respect to $x$ at the point, $x=2, y=1$ and $z=3$ is _______.