HP 39g+ - Manual (Page 167)

Using mathematical functions 11-23
To find the
indefinite integral
using formal
variables For example, to find the indefinite integral of
use:
1. Enter the function.
0
S1 3
X 5
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:
This result is derived from substituting X=S1 and X=0 into
the original expression found in step 1. However,
substituting X=0 will not always evaluate to zero and may
result in an unwanted constant.
To see this, consider:
3x
2
5 – x d
∫
( )
∫ − X X S , 5 3 , 1 , 0 2
hp 39g +
3x
2
5 – x 5x – 3
x
3
3
-----
X ∂
∂ X
( )
---------------
 
 
 
 
 
+ = d
∫
x 2 – ( )
4
x
x ( 2 )
5
–
5
------------------- = d
∫