A-LevelFurther MathematicsImplicit DifferentiationMay/June 2015Paper 1 Q69 Marks
A curve has equation x² – 6xy + 25y² = 16. Show that dy/dx = 0 at the point (3, 1). By finding the value of d²y/dx² at the point (3, 1), determine the nature of this turning point.
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