The round function will return a specified value to the nearest number, the default value is to the nearest 0, if you wish to the nearest decimal point the function would be Round(number, numer of decimals).  I haven't found a way to round to the nearest tenths or more (one way to get around this is first divide your number by 10, assuming you want to round to the nearest tenths, them do the default round and finally multiply by 10, see the last example).  Also the return value is the same type as the value that is being rounded, so if the number is a double the return value is a

This function calculates the natural log (base e) of the specified number.  The value that is returned is of a type double.  To see an example of how to calculate the log of a base 10 see the snippets section.

Returns a number containing the base of a natural logarithm (e) raised to the specified power.  The return value is a double type.

Calculates the cosine of a specified angle.  It returns a double value.

Calculates the value containing the angle whose tangent is the specified number.  The result is a double type.  The example below calculates pi.

Returns the absolute value of a specified number.