The derivative of a function at a given point is the rate of change of the function's value at that point. It is often interpreted as the slope of the tangent line at that point. Mathematically, the derivative is the limit of the difference quotient as the interval approaches zero.
Key Concepts:
f(x)
at a point x=a
is given by:f'(a) = lim (h -> 0) [f(a + h) - f(a)] / h