Calculate the cosine and the sine of the given ffp-number
fnum1 that represents an angle in radians. The function
returns the sine of that number as a result and puts
the cosine of that number into *pfnum2 which must represent
a valid pointer to a ffp-number.
INPUTS
pfnum2 - pointer to a Motorola fast floating point number
fnum1 - Motorola fast floating point number
RESULT
*pfnum2 - Motorola fast floating point number
direct result - Motorola fast floating point number