@Carl Love 

Thank you very much!

I already tried for hours and even calculated 4 entries of the resulting matrix by hand!

BTW: After correction of some more mistakes, the result is

Again, thank you very much!

nilsson

@Markiyan Hirnyk 

Thanks!

No, it should be 3*pi/2.

I corrected it, but unfortunately it does not change my problem.

Here is the corrected worksheet: transformation_L1.mw

And the correct Transformation Matrix: