To find the indefinite integral using formal variables
For example, to find the indefinite integral of
∫3x2 – 5dx use:
∫(0, S1, 3 X 2 − 5, X )
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.
hp 39g+
Thus, substituting X for S1, it can be seen that:
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| x3 | | |
2 |
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| 3 | ||||
∫3x – 5dx= | – 5x + 3 | | ||||
| ∂ |
| (X) | | ||
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| ∂X | ||||
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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.
∫( )4 (x – 2 )5
To see this, consider: x – 2 dx=
5
Using mathematical functions |