निम्नलिखित में से कौन सा सत्य नहीं है?

1
y' = \(\frac1h[\triangledown y+\frac12\triangledown^2y+\frac13\triangledown^3y+...]\)
2
y'' = \(\frac1{h^2}[\triangledown^2 y+\triangledown^3y+\frac{1}{12}\triangledown^4y+...]\)
3
e-hD = 1- \(\triangledown\)
4
E = ehD

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