Operation Manual

Chapter 2: Math, Angle, and Test Operations 46
nDeriv(
nDeriv( (numerical derivative) returns an approximate derivative of expression with respect to variable,
given the
value at which to calculate the derivative and H (if not specified, the default is 1âL3). nDeriv( is
valid only for real numbers.
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.
As H becomes smaller, the approximation usually becomes more accurate. In MathPrint™ mode, the
default H is 1
EM3. You can switch to Classic mode to change H for investigations.
You can use
nDeriv( once in expression. Because of the method used to calculate nDeriv(, the
TI-84 Plus C 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
MathPrint™:
f x
fx +fx ––
2
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