CharleyZ / symja

Automatically exported from code.google.com/p/symja
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Is the bug in function Integrate[] #25

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago
What steps will reproduce the problem?
I call the function: "Integrate[1/(x^3+1),x]

What is the expected output? What do you see instead?
I use the wolframalpha.com, the result is (2 Sqrt[3] ArcTan[(-1 + 2 x)/Sqrt[3]] 
+ 2 Log[1 + x] - Log[1 - x + x^2])/6. But in symja, the result is 
x*Log[4*x]+1/3*Log[x+1]-x*Log[-2*x-1]. Is it bug?

What version of the product are you using? On what operating system?

Please provide any additional information below.

Original issue reported on code.google.com by huynhlam...@gmail.com on 2 Oct 2010 at 9:58

GoogleCodeExporter commented 8 years ago
I changed the implementation for integration of the partial fraction 
decomposition:
http://code.google.com/p/symja/source/detail?r=568

Please check again with new implementation.

Original comment by axelclk@gmail.com on 10 Oct 2010 at 10:27

GoogleCodeExporter commented 8 years ago

Original comment by axelclk@gmail.com on 10 Oct 2010 at 10:27

GoogleCodeExporter commented 8 years ago

Original comment by axelclk@gmail.com on 27 Oct 2010 at 4:37