Can CB do scientific calculation?

Hi,
yes, you can use any math function. Here the list of php math functions, all of them are available:

http://php.net/manual/en/function.sin.php

so if you write at your code for ex

$result=sin($yourinput);

being 'yourinput' one of your fields variable names, it will work. Please double check you have not any other syntax error, like the ; at the end of the line for ex. Let us know if you need further help.

Regards