HP 39gs User Manual page 175

To find the
indefinite integral
using formal
variables
Using mathematical functions
4. Press to display
the result. Note: Use
the arrow keys to view
the entire function.
|
You could also just define
F1 x ( ) (
= d x sin
For example, to find the indefinite integral of
2
∫
3x – 5 x d
use:
(
∫
−
2
, 0 S 1 3 , X , 5
1. Enter the function.
0
S1
X
X
2. Show the result format.
3. Press to close the
show window.
4. Copy the result and
evaluate.
Thus, substituting X for S1, it can be seen that:
2
∫
3x – 5 d x = –
2
( ) x ( ) )
x + 2 cos
.
)
X
3
5
3
x
⎛ ⎞
---- -
⎜ ⎟
3
⎜ --------------- ⎟
5x + 3
∂ X ( )
⎜ ⎟
⎝ ⎠
∂
X
13-23