Derived Operations

The remaining operations (neg, sub, div) don’t need their own gradient rules. They are composed from the primitives above:

• neg(a) = a * (-1), uses mul
• sub(a, b) = a + (-b), uses add and neg
• div(a, b) = a * b^(-1), uses mul and pow

Because every step is tracked in the computation graph, the chain rule handles these compositions automatically.