HP 40gs - Program Constants and Physical Constants

13-24 Using mathematical functions
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:
The ‘extra’ constant of
32/5 results from the
substitution of into
(x –2)
5
/5, and should be
disregarded if an
indefinite integral is
required.
Program constants and physical constants
When you press , three menus of functions and
constants become available:
• the math functions menu (which appears by default)
• the program constants menu, and
• the physical constants menu.
The math functions menu is described extensively earlier
in this chapter.
3x
2
5– x 5x–3
x
3
3
-----
X∂
∂
X()
---------------
⎝⎠
⎜⎟
⎜⎟
⎜⎟
⎛⎞
+=d
∫
x 2–()
4
x
x( 2 )
5
–
5
-------------------
=d
∫
x 0=
hp40g+.book Page 24 Friday, December 9, 2005 12:27 AM