Texas Instruments TI86 User Manual - Page 66

54 Chapter 3: Math, Calculus, and Test Operations You must set Dec mode to use the calculus functions. For evalF, nDer, der1, and der2, variable can be a real or complex number or list. You can use der1 and der2 in expression. You can use nDer once in expression. For fnInt, fMin, and fMax, lower < upper must be true. The CALC (Calculus) Menu - † evalF nDer der1 der2 fnInt 4 fMin fMax arc The calculus functions return values with respect to any user-created variable, to built-in variables eqn and exp, and to graphing variables such as x, t, and q. evalF(expression,variable,value) Returns the value of expression with respect to variable for a given variable value nDer(expression,variable ã,valueä) Returns an approximate numerical derivative of expression with respect to variable for the current variable value or specified variable value der1(expression,variableã,valueä) Returns the value of the first derivative of expression with respect to variable for the current variable value or specified variable value der2(expression,variableã,valueä) Returns the value of the second derivative of expression with respect to variable for the current variable value or specified variable value fnInt(expression,variable, lower,upper) Returns the numerical integral of expression with respect to variable between lower and upper boundaries fMin(expression,variable, lower,upper) Returns the minimum value of expression with respect to variable between lower and upper boundaries fMax(expression,variable, lower,upper) Returns the maximum value of expression with respect to variable between lower and upper boundaries arc(expression,variable, start,end) Returns the length of a segment of a curve defined by expression with respect to variable between start and end