A curve has the equation 2x2+xy+2y2=202x^2 + xy + 2y^2 = 202x2+xy+2y2=20
The gradient of the tangent to the curve is -1 at the points R R\,R and SSS.
Show that x−y=0x - y = 0x−y=0 at R R\,R and SSS.
Find the coordinates of R R\,R and SSS.
717 exam-style questions on Edexcel A Level Maths Differentiation, covering 9.1 Differentiating sin x and cos x, 9.2 Differentiating exponentials and logarithms, 9.3 The Chain Rule, 9.4 The Product Rule, 9.5 The Quotient Rule, 9.6 Differentiating Trigonometric Functions, 9.7 Parametric Differentiation, 9.8 Implicit Differentiation, 9.9 Using Second Derivatives, and 9.10 Rates of Change. Each one has a worked solution and a mark scheme showing where the marks go.