HP 40gs HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 184
LNP1(<num>), The ‘Calculus’ group of functions, (<num>, <expression>, <var_name>)
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LNP1() As in the previous function, this is supplied to supplement the LN function and gives a more accurate value when x is near zero. Again, this is not something which would normally be of concern at school level. The 'Calculus' group of functions This group consists of three functions, the integrate, or function, the differentiate, or function and the TAYLOR function. The first two are discussed in detail in the chapter dealing with the Function aplet (see pages 59 to 75) and so a brief outline only is given below. (,,,) This function will return the definite integral of the expression when integrated with respect to the variable specified. Any other variables in the expression will be regarded as constants with values taken from the current memory values. Symbolic integration can be done in two ways. Firstly by replacing one of the limits of integration with a symbolic variable S1 (S1...S5). Secondly, and more conveniently, by doing it in the Function aplet (see pages 59 to 75). () This function will differentiate the expression with respect to the variable specified. This can be done in two ways. When done in the HOME view the result is numeric because the derivative is evaluated for the current value of the variable in memory. For example, if X currently has the value of 3 then the result is as shown right. When done in the Function aplet, or using a symbolic variable (S1...S5), the result is the algebraic derivative (see pages 59 to 75). 184