The point K K\,K lies on the curve with equation y=3ex+1ex+1\displaystyle y = \frac{3e^x+1}{e^x+1}y=ex+13ex+1 with xxx-coordinate 0.
Find an equation of the normal to the curve at the point KKK.
51 exam-style questions on Edexcel A Level Maths 9.3 The Chain Rule. Each one has a worked solution and a mark scheme showing where the marks go.