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(C<sin cos tan cot asin acos atan acot sinh cosh asinh acoth>).
C<log> indicates a natural logarithm.

Additionally, you may include derivatives in the formula which
will be evaluated (analytically) for you. The syntax for this is:
C<partial_derivative(a * x + b, x)>. (Would evaluate to C<a>.)

In order to allow for errors in constants, the program uses the
L<Math::SymbolicX::Error> parser extension: use the
C<error(1 +/- 0.2)> function to include constants with
associated uncertainties in your formulas.

The input files may be of any format recognized by the
L<Spreadsheet::Read> module. That means: Excel sheets,
OpenOffice (1.0) spreadsheets, CSV (comma separated values)
text files, etc.

The program reads tabular data from the spreadsheet file.
It expects each column to contain the data for one variable
in the formula.