File: t_SymbolicHessian_std.expout

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hessian= 
|    d^2(y0) / d(x0)^2 = 2
| d^2(y0) / d(x1)d(x0) = 0
|    d^2(y0) / d(x1)^2 = 0
| d^2(y0) / d(x2)d(x0) = 0
| d^2(y0) / d(x2)d(x1) = 0
|    d^2(y0) / d(x2)^2 = 18*x2

value at [-1.0, 4.0, -4.0] = sheet #0
[[   2   0   0 ]
 [   0   0   0 ]
 [   0   0 -72 ]]