Find equations of
1. the tangent plane and,
2. the normal line to the surface represented by the equation:
$\displaystyle yz = ln(x+z)$
at the point (0,0,1).

Find equations of
1. the tangent plane and,
2. the normal line to the surface represented by the equation: $\displaystyle yz = ln(x+z)$ at the point (0,0,1).

If $\displaystyle F = yz - \ln \left( {x + z} \right)$ then the vector you need is $\displaystyle \nabla F\left( {0,0,1} \right)$.