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derivative problem

Tue, 17 Mar 2009 19:55:27 -0700

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

Tue, 17 Mar 2009 23:47:54 -0700

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

Wed, 18 Mar 2009 02:39:33 -0700

Are you searching a numerical solution or a symbolic one?

Re: derivative problem

Wed, 18 Mar 2009 19:44:43 -0700

I'm trying to solve it analytically, not numerically.

Re: derivative problem

Wed, 18 Mar 2009 19:52:22 -0700

Thanks for your reply. But unfortunately, you have misunderstood my question.
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.

By the way, thanks for your reply.

Re: derivative problem (Solved)

Thu, 19 Mar 2009 19:46:00 -0700

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)

Fri, 20 Mar 2009 00:33:01 -0700

Can you tell me how did you solve the problem?

Re: derivative problem (Solved)

Tue, 24 Mar 2009 19:16:40 -0700

Ok, please refer to the attachment. Hope you can understand what did I write there. :)

Attachment: Description.doc (30208 bytes | downloaded 95 times)

Re: derivative problem (Solved)

Wed, 25 Mar 2009 00:16:39 -0700

Thank you.