Mathematica Help
1 Attachment(s)
I want mathematica to evaluate a certain expression (see attached) assuming that n is an integer. The answer is far from what it produces. Maple produces the right answer but I don't have access to it.
The expression is [tex]\frac{\int_{\pi}^{\pi}\sin(x)\cos(nx)\dx}{\int_{\pi}^{\pi}\cos^2(nx)\dx}[/tex] 
You need to put a space between your n and x. Mathematica is treating nx as a single variable, which explains the funky result.

One other thing to try...I don't have Mathematica in front of me here at work, but I do remember also reading an article about Mathematica getting into a bit of trouble in some cases when using the sybolic integration sign. If Stephan's tip doesn't help, you may try using "Integrate" instead of the symbolic operator.

Use '*' everywhere, to avoid possible problems. Doesn't look nice, though, but nevermind.

The error was the missing *. Thanks for the help.

Quote:

All times are GMT 5. The time now is 05:55 PM. 
Powered by vBulletin Copyright ©2000  2014, Jelsoft Enterprises Ltd.
© 2014 Physics Forums