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)
333 exam-style questions on WJEC A Level Maths 3.6 Differentiation (A-level only), covering 3.6.1 Differentiation (A-level only), 3.6.2 Differentiation (A-level only), 3.6.3 Differentiation (A-level only), 3.6.4 Differentiation (A-level only), 3.6.5 Differentiation (A-level only), 3.6.6 Differentiation (A-level only), 3.6.7 Differentiation (A-level only), and 3.6 Differentiation (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.