A function which gives the slope
of a curve; that is, the slope of
tangent to a function.
The derivative of a function f at
a point x is commonly written f
For example, if f(x) = x3 then f '(x)
The slope of the tangent line when x = 5 is f '(x)
= 3·52 = 75.
Difference quotient, limit, derivative
rules, differentiable, differentiation,