HP 12c Solutions Handbook page 115

Relative error less than 0.042% over the range 0 < x < 5.5
Reference:
Stephen E. Derenzo, "Approximations for Hand Calculators Using Small
Integer Coefficients," Mathematics of Computation, Vol. 31, No. 137, page
214-225; Jan 1977.
KEYSTROKES
CLEAR
0
8
3
DISPLAY
00-
01- 44
02-
03-
114
0
8
3