Find the derivative of 
at the point 
with respect to the vector 
, where 
, 
, and 
.
Definitions:
Thevenin's Theorem
A principle that simplifies a complex electrical circuit to a single voltage source and series resistance for easier analysis.
Equivalent Circuit
A simplified electrical circuit that replicates the performance characteristics of a more complex circuit or electrical device.
Norton's Theorem
An electrical theorem that simplifies complex circuits into equivalent circuits made of a single current source and parallel resistance.
Parallel Resistance
The overall resistance of resistors connected in parallel, calculated in a way that the total resistance is always less than the smallest individual resistor's resistance in the circuit.
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