Plzz solve....

12.13. Let g: R" - R be a smooth function. Show that the Gauss-Kronecker curva- ture K of the graph of g is given by the formula K = det 1/ ( 1 + ag 2 \\(W/2) + 1 axi where the orientation N is chosen so that N(p) . (p, 0, ..., 0, 1) > 0 for all pin the graph.12.13. Let g: R" - R be a smooth function. Show that the Gauss-Kronecker curva- ture K of the graph of g is given by the formula K = det 1/ ( 1 + ag 2 \\(W/2) + 1 axi where the orientation N is chosen so that N(p) . (p, 0, ..., 0, 1) > 0 for all pin the graph