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The derivative of f at x is given by
f’(x) = lim f(x + ∆x) – f(x) ∆x -> 0 ∆x
provided the limit exists. For all x for which this limit exists, f’ is a function of x.
f’(x) “f prime of x” dy “the derivative of y with respect to
x” dx “ dy – dx” y’ “y prime” d [f(x)] dx Dx[y]
The existence of the limit requires that the one-sided limits exist and are equal.f’(c) = lim f(x) - f(c) x c- x - c
f’(c) = lim f(x) - f(c) x c+ x - c
(The derivative from the left)
(The derivative from the right)
f is differentiable on the closed interval [a, b] if it is differentiable on (a, b) and if the derivative from the right at a and the derivative from the left at b both exist.
Conditions where a function is not differentiable:
1. At a point at which a graph has a sharp turn.2. At a point at which a graph has a vertical tangent line.
3. At a point at which the function is not continuous.