While the exact base function ψ 2 ( h ) is not specified, commonly used functions in the non-standard finite difference method can be introduced as follows: ψ 2 ( h ) = exp ( h ) − 1 , ψ 2 ( h ) = h , ψ 2 ( h ) = sinh ( h ) , ψ 2 ( h ) = 1 − exp...
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