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I try to use

InterpolatingPolynomial[{f[1]=2,f'[1]=3,f[2]=6, f'[2]=7, f''[2]=8}, Method->"Hermite"]

in WolframAlpha, but it's wrong.

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InterpolatingPolynomial[{{{1}, 2, 3}, {{2}, 6, 7, 8}}, x] –  belisarius Jan 14 '13 at 19:40
    
Thank you! You can add that as an answer I think. –  deem Jan 14 '13 at 19:50
    
Is this a wolfram alpha question, are they on topic? –  image_doctor Jan 14 '13 at 19:57
    
Are you using the WolframAlpha website directly, or Mathematica? If you are using the website directly, then it is off-topic as this website is dedicated to Mathematica only. –  rcollyer Jan 14 '13 at 20:05
    
I use both of them. –  deem Jan 14 '13 at 20:06
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1 Answer

You should try

InterpolatingPolynomial[{{{1}, 2, 3}, {{2}, 6, 7, 8}}, x]

In WA:

enter image description here

In Mathematica:

enter image description here

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