1. C

    Implicit differentiation - where'd the x' go?

    Book example (and everywhere else online): Differentiate the folium of descartes: x^3 + y^3 = 6xy Left side: 3x^2 + 3y^2 y' Right side using product rule: 6xy' + 6y Where did the x' go? (Ignoring the 6 for now): The product rule is (fg)' = fg' + gf' or: (xy)' = xy' + yx'...