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Taylor series f(xi+1)=f(xi)+f'(xi)h+(f''(xi)/2!)h2+(f'''(xi)/3!)h3+..... given f''(xi)=(-f(xi+3)+4f(xi+2)-5f(xi+1​)+2f(xi))/h2 derive the second derivative of forward finite difference  

Taylor series f(xi+1)=f(xi)+f'(xi)h+(f''(xi)/2!)h2+(f'''(xi)/3!)h3+.....

given f''(xi)=(-f(xi+3)+4f(xi+2)-5f(xi+1​)+2f(xi))/h2

derive the second derivative of forward finite difference  

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