3 The equation of a curve is \(y = 2 x ^ { 2 } - 3\). Two points \(A\) and \(B\) with \(x\)-coordinates 2 and \(( 2 + h )\) respectively lie on the curve.
- Find and simplify an expression for the gradient of the chord \(A B\) in terms of \(h\).
- Explain how the gradient of the curve at the point \(A\) can be deduced from the answer to part (a), and state the value of this gradient.