118. Chain Rule
The derivative of with respect to is the sum of all possible paths from to :
Example
Let:
We want to compute:
Step 1: Apply the multivariable chain rule
Step 2: Compute partial derivatives
Step 3: Plug in:
The derivative of with respect to is the sum of all possible paths from to :
Let:
We want to compute:
Step 1: Apply the multivariable chain rule
Step 2: Compute partial derivatives
Step 3: Plug in: