Question 5 - A-Level Maths

Exam Board	AQA
Module	C4 (Core Mathematics 4)
Year	2009
Session	June
Topic	Implicit equations and differentiation

5 A curve is defined by the equation \(4 x ^ { 2 } + y ^ { 2 } = 4 + 3 x y\).
Find the gradient at the point ( 1,3 ) on this curve.