Now we are talking.

Thanks

I imagine there's a lot to correct. It's a first.

Small point, irrelevant to the error messages, logarithm should be 10-based.

The result, if using for esample, 30°, should be 1860.6332

If I digit, i.e. 30°, I get:

Fi(30);            7915.7 ln(tan(0.3322188468 Pi))

Not a numerical result

Thanks to all for the help