# Derivative

### Derivative of a Function at a Point

The derivative of the function f(x) at x = a is the value of the limit, if it exists at this point when the variable, h, tends to zero.

#### Examples

Find the derivative of the function f (x) = 3x² at x = 2.

Find the derivative of the function f(x) = x² + 4x − 5 at x = 1.

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