Differentiability of Piecewise Functions - Calculus

21 how to check continuity & differentiability of function f(x,y)=(xy^2)/(x+y)

(051) Differentiability of a function

CHECK FOR DIFFERENTIABILITY OF THE FUNCTION f DEFINED BY f(x)=|x-5\,at the point x=5

Calculus 1 Lecture 2.2: Techniques of Differentiation (Finding Derivatives of Functions Easily)

Derivative as a concept | Derivatives introduction | AP Calculus AB | Khan Academy