Sunday 5:27 PM PDT 10/4/2009 MMIX October 04

http://regumrex.org/degrad.html

NaN
In computing, NaN, which stands for Not a Number, is a value or symbol that is usually produced as the result of an operation on invalid input operands, especially in floating-point calculations. For example, most floating-point units are unable to explicitly calculate the square root of negative numbers, and will instead indicate that the operation was invalid and return a NaN result. NaNs may also be used to represent missing values in computations
Reference:
NaN - Google Search Results

Degrees ( ° ) and Radians ( rad ) If more than 1 (one) radians, use radians; if less than 1 (one) radian, say radian. So too with the usage of the terms degree and degrees. 360° = 2 p radians 180° = 1 p radians 1° = (1 p / 180) radians 1° = (Math.PI / 180) radian (Math.PI / 180) radian = 1°

The angles in degrees
will be simultaneously displayed in the three output boxes.

The sine, cosine and tangent values of angles (in degrees)
will be simultaneously displayed in radians (in the three output boxes below).

Input radian values (of the sine, cosine and tangent of the angles in radians)
and the angles (in radians) will be simultaneously displayed in the three output boxes below.