Implicit Differentiation
www.mathsisfun.com › calculus › implicitStart with: y = sin−1 (x) In non−inverse mode: x = sin (y) Derivative: d dx (x) = d dx sin (y) 1 = cos (y) dy dx. Put dy dx on left: dy dx = 1 cos (y) We can also go one step further using the Pythagorean identity: sin 2 y + cos 2 y = 1. cos y = √ (1 − sin 2 y ) And, because sin (y) = x (from above!), we get: