HP HP-15C - Page 242

242 Appendix E: A Detailed Look at f
Calculate the integral in the expression for J
4
(1),




0
)sin4cos( d
First, switch to Program mode and key in a subroutine that evaluates the
function f(θ) = cos (4θ  sin θ).
Keystrokes
Display
|¥
000-
Program mode.
´ CLEAR M
000-
´ b 0
001–42,21, 0
4
002– 4
*
003– 20
®
004– 34
[
005– 23
-
006– 30
\
007– 24
|n
008– 43 32
Now, switch to Run mode and key the limits of integration into the X- and
Y-registers. Be sure the trigonometric mode is set to Radians, and set the
display format to i 2. Finally, press ´ f0 to calculate the integral.
Keystrokes
Display
|¥
Run mode.
0 v
0.0000
Keys lower limit into Y-register.
| $
3.1416
Keys upper limit into X-register.
| R
3.1416
Sets the trigonometric mode to
Radians.
´ i 2
3.14 00
Sets display format to i 2.
´ f 0
7.79 -03
Integral approximated in i 2.
®
1.45 -03
Uncertainty of i 2
approximation.