The Chain Rule
The Chain Rule Case I z x y t t start with z z is a function of x and y x and y are functions of t Put the appropriate derivatives along the branches Tree diagram Multiply along each path and sum the contributions of both paths.
Chain Rule - Example 1
Chain Rule - Example 2
The Chain Rule Case II z x y tt Put the appropriate derivatives along the branches Tree diagram s s
Chain Rule - Example 3 s s t t r z
Chain Rule - More general case We can generalize the chain rule to any number of variables. s st t x r r w y st r
Chain Rule - Implicit Differentiation 2D Chain rule:
Chain Rule - Example 5 (b) Find the equation of the tangent line to the curve at the point (1,1).
Chain Rule - Implicit Differentiation 3D
Chain Rule - Example 6