Manual Texas Instruments TI-36X Pro (page 28 of 78) (English)

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Example in MathPrint™ mode

Example in Classic mode

Classic:

nDeriv(expr ession,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 calculator can return a

false derivative value at a nondifferentiable point.

³ Problem

Find the slope of the tangent line to the curve f(x) = x

–4x at

What do you notice? (Fix 3 decimal places.)

%A %A

z F T 5 z ""

M 1 <

%A %A

z F T 5 z

%`z

%`M1 )

f′ x()

fx ε+()fx ε–()–

2ε

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Texas Instruments TI-36X Pro Manual

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