finding the derivative of u.

I try to find the derivative of u.

somehow i not clear with the meaning of this equation.

can someone explain to me? thanks in advanced.

kindly refer to attached mathcad15 file.

Best answer by Werner_E

It looks to me that you use xi both as varaible name AND as function name. This will not work.

When you want to define a function you also have to state which variable(s) it should depend on.

f(x):=,,,,term in x ...

Are you looking for something like this:

Answer

25-Diamond I

It looks to me that you use xi both as varaible name AND as function name. This will not work.

When you want to define a function you also have to state which variable(s) it should depend on.

f(x):=,,,,term in x ...

Are you looking for something like this:

Author

1-Visitor

many thanks werner exinger . seems like I forgot to put multiplication in the equation.

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