I have to show that for For , I got and for , I got Is either derivative correct? I think I am close but cant quite figure where I am going wrong. Help please!
Last edited by tammyl; March 25th 2013 at 12:11 PM.
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The correct answer is u_{xx }= u_{t = [}exp(-x^{2}/4t)/4sq. root pi *t^{3/2}] * (-1 + x^{2}/2t). Basically something is going wrong within the brackets of your answer. Check those.
If you want to check your intermediate result, I got the same answer as mrmaaza123 for and . - Hollywood
the two answers above are correct if you are looking for some help on it.. wolfram math have a nice applet to get partial derivatives and also shows the workings.
Can anyone show me the steps in solving ? I have now - thanks to you all!
For . Use the product rule to get: then factor out an and then your left with the correct Hope this helps. p.s in the first product dont forget that
Last edited by joeDIT; March 25th 2013 at 03:34 PM.
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