A-LevelFurther MathematicsCalculus (Implicit Differentiation & Stationary Points)Oct/Nov 2016Paper 1 Q811 Marks
A curve C has equation x² + 4xy – y² + 20 = 0. Show that, at stationary points on C, x = −2y. Find the coordinates of the stationary points on C, and determine their nature by considering the value of d²y/dx² at the stationary points.
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