WeBWorK Standalone Renderer

Use the level curves of the function $z=f(x,y)$ to decide the sign (positive, negative, or zero) of each of the partial derivatives at the point $P$ . Assume the $x$ - and $y$ -axes are in the usual positions.

$f_x(P)$ is
$f_y(P)$ is
$f_{xx}(P)$ is
$f_{yy}(P)$ is
$f_{xy}(P)$ is

You can earn partial credit on this problem.