The atan function returns the trigonometric arc tangent (inverse tangent) of the number passed to it; that is, the angle whose tangent is equal to the given value. The result is expressed in radians. Radians can be converted to degrees by multiplying by 180 and dividing the result by the value of the constant pi.

The average function returns the average of the numbers passed to it.

The compound function is used to compute the present or future value of a compound interest-bearing account. Rate represents the interest rate per period, and periods is the number of periods over which the value is calculated. The formula for compound is: compound(rate,periods) = (1 + rate)^periods.

The cos function returns the cosine of the angle which is passed to it. The angle must be expressed in radians.

The exp1 function returns 1 less than the mathematical exponential of its argument (1 less than the result of the constant e raised to the power specified by the argument). That is, it computes expnumber) - 1.

The exp1 function returns the value of 2 raised to the power specified by the argument.

The min function returns the lowest-value number form a list of numbers passed to it. If the source of the list is a container with more than one line in it, only the first line is used.

The round function returns the source number rounded off to the nearest integer. Any odd integer plus exactly 0.5 rounds up; any even integer (or 0) plus exactly 0.5 rounds down. If the source number is negative, the negative sign is removed internally, and rounded to its absolute value, then the negative sign is put back on.

The sin function returns the sine of the angle that is passed to it. The angle must be expressed in radians.

The sqrt function returns the square root of the positive number passed to it. If you pass a negative number, you get the result -NAN(001), which means "not a number".