Solve the higher order derivatives: y''-6y+9y=0, y(0)=2, y'(0)=0

Find the local maximum and minimum values and saddle points of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function
$f(x,y)=x^3-6xy+8y^3$

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