The curve has equation y=x4+x2\displaystyle y = \frac{x}{4+x^2}y=4+x2x.
Find the coordinates of the stationary points of the curve and determine the nature of the stationary points.
57 exam-style questions on Edexcel A Level Maths 9.9 Using Second Derivatives. Each one has a worked solution and a mark scheme showing where the marks go.