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Topic: Calculating derivate in Mathematica 9 giving wrong result
Replies: 1   Last Post: Jul 3, 2013 6:04 PM

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Posts: 1
Registered: 7/3/13
Calculating derivate in Mathematica 9 giving wrong result
Posted: Jul 3, 2013 4:52 AM
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In[5]:= D[(x^2 - 2)/(x^3 + 6), x]

Out[5]= -((3 x^2 (-2 + x^2))/(6 + x^3)^2) + (2 x)/(6 + x^3)

That is from Mathematica 9.

The wolfram alpha site and my textbook give this answer:

d/dx((x^2+x-2)/(x^3+6)) = (-x^4-2 x^3+6 x^2+12x+6)/(x^3+6)^2

Please tell me what I am doing wrong.

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