HP 15c - Manual (Page 242)

242 Appendix E: A Detailed Look at
f
Calculate the integral in the expression for J
4
(1),



  
0
) sin 4 cos( 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.