Implicit Differentiation (Edexcel A-Level Mathematics): Quizzes

Finding derivatives when $y$ not explicit

$x^2 + y^2 = 1$

For circles and ellipses

$2y \frac{dy}{dx}$

$\frac{-x}{y}$

$y + x \frac{dy}{dx}$

Differentiate both sides w.r.t. $x$

Finding tangent and normal lines

Set $\frac{dy}{dx} = 0$

$\frac{7}{11}$