HP 39GS hp 39gs_user's guide_English_E_HDPMG39AE13.pdf - Page 176

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: (x - 2)4dx= (---x----------2----)--55 The 'extra' constant of 6.4 results from the substitution of x = 0 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. Program constants The program constants are numbers that have been assigned to various calculator settings to enable you to test for or specify such a setting in a program. For example, the various display formats are assigned the following numbers: 1 Standard 2 Fixed 3 Scientific 4 Engineering 5 Fraction 6 Mixed fraction In a program, you could store the constant number of a particular format into a variable and then subsequently test for that particular format. 13-24 Using mathematical functions