A curve has the equation x2+2xy−y2=1x^2 + 2xy - y^2 = 1x2+2xy−y2=1:
Find an expression for dydx\displaystyle \frac{dy}{dx}dxdy
Find an equation for the normal to the curve at the point (1,2)(1, 2)(1,2)
Practise Edexcel A Level Maths 9.3 The Chain Rule with exam-style questions for A Level Maths. 50 questions, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.