I don't know why mathcad can't solve

I practiced integration. First picture is a example that I practiced

After practicing, I applied to my work with same method.

But I got error. I thought why error is generated althogh the method is same. I can't know.

1-Visitor

The first error I noticed was that you have typed f(r), instead of t(r).

Author

1-Visitor

I did again as changed f(r) to t(r). But I got error agian...

And it is right to type f(r).

you can know it thorugh first picture

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