How does the calculator compute the derivative of a function
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How does the calculator compute the derivative of a function

[From: ] [author: ] [Date: 11-05-05] [Hit: ]
t,x,h) = [ƒ(x + h) − ƒ(x − h)]/(2h), where ƒ(t) is the function, t is the respective variable, x is the point at which to evaluate,......
I know how to use a TI-84 or TI-89 to find it, but I want to know in an explanation how does a calculator compute the derivative of a function, the details behind it.

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The TI-84 Plus uses an algorithm to compute the derivative, given by the formula:
nDeriv(ƒ(t),t,x,h) = [ƒ(x + h) − ƒ(x − h)]/(2h), where ƒ(t) is the function, t is the respective variable, x is the point at which to evaluate, and h is the step size (default value if omitted is .001).

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google it :/
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