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)
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.