This function returns the tangent of an angle.  The return value is of type double.

This function returns the square root of a number.  The return value is a double type.

The Sin function returns the sine of an angle.  The return value is of type double.

This function will return an indicator of the sign.  If the number is negative it returns -1, if positive it returns 1 and if it is 0 it returns 0.  The return value is an integer type.

Need to add explanation.

Need to add explanation

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.