## Matlab

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derivative problem Posted by spc on 17 Mar 2009 at 7:55 PM
Can anyone help me in solving the derivative of the equation f=sinh(πx)*cos(πy)/sinh(π)? I need to derive it based on its unit normal vector, means i need the answer of df/dn.

[π =pi=3.142]

Thanks.
Re: derivative problem Posted by byronm06 on 17 Mar 2009 at 11:47 PM
i may be wrong, but you just take the derivative of f. that means, if you have F=A/B then F' = [B *(derivative of A)]-[A * (derivative of B)] / B^2

in other words: low D high minus high D low all over low squared.
where D means derivative of.
Re: derivative problem Posted by giug on 18 Mar 2009 at 2:39 AM
Are you searching a numerical solution or a symbolic one?
Re: derivative problem Posted by spc on 18 Mar 2009 at 7:44 PM
I'm trying to solve it analytically, not numerically.
Re: derivative problem Posted by spc on 18 Mar 2009 at 7:52 PM
I know derivative of a funtion, but this equation, it doesn't have the unit normal vector,n in it, so I don't know how to derive it become df/dn. The way you teach me is to derive the equation become df/dx or df/dy.

Re: derivative problem (Solved) Posted by spc on 19 Mar 2009 at 7:46 PM
To whom it may concern,
I had already solved the problem. So, need not to think for me on this derivative problem. Thanks.
Re: derivative problem (Solved) Posted by giug on 20 Mar 2009 at 12:33 AM
Can you tell me how did you solve the problem?
Re: derivative problem (Solved) Posted by spc on 24 Mar 2009 at 7:16 PM
Ok, please refer to the attachment. Hope you can understand what did I write there. :)