solve this partial differentiation and find if maximum,minimum or saddle.
f(x,y)=x^3-y^3+6xy...
this is not a PDE
Does the ellipsis indicate more terms?
That xy term should indicate a saddle point.
f(x,y)=x^3-y^3+6xy...
Does the ellipsis indicate more terms?
That xy term should indicate a saddle point.