EXP returns e raised to a specified power, where e is the base of natural
logarithms. LOG returns the natural logarithm of a numeric expression.
 
EXP(numeric-expression)
LOG(numeric-expression)
 
    - numeric-expression    For EXP, a number less than or equal to 88.02969.
                            For LOG, any positive numeric expression.
 
Example:
    PRINT EXP(0), EXP(1)         'Output is:  1  2.718282
    PRINT LOG(1), LOG(EXP(1))    'Output is:  0  1