Texas Instruments TI-84 PLUS SILV Guidebook - Page 48
fnInt
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MathPrint™: Classic: nDeriv(expression,variable,value[,H]) nDeriv( uses the symmetric difference quotient method, which approximates the numerical derivative value as the slope of the secant line through these points. f′(x) = f---(--x 2----ε---f--(---x As H becomes smaller, the approximation usually becomes more accurate. In MathPrint™ mode, the default H is 1EM3. You can switch to Classic mode to change H for investigations. MathPrint™ Classic You can use nDeriv( once in expression. Because of the method used to calculate nDeriv(, the TI-84 Plus can return a false derivative value at a nondifferentiable point. fnInt( fnInt( (function integral) returns the numerical integral (Gauss-Kronrod method) of expression with respect to variable, given lower limit, upper limit, and a tolerance (if not specified, the default is 1âL5). fnInt( is valid only for real numbers. MathPrint™: Classic: fnInt(expression,variable,lower,upper[,tolerance]) In MathPrint™ mode, the default H is 1EM3. You can switch to Classic mode to change H for investigations. Chapter 2: Math, Angle, and Test Operations 41