Evaluate
V_{1}+\frac{V}{I}
Differentiate w.r.t. V_1
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\frac{V_{1}I}{I}+\frac{V}{I}
To add or subtract expressions, expand them to make their denominators the same. Multiply V_{1} times \frac{I}{I}.
\frac{V_{1}I+V}{I}
Since \frac{V_{1}I}{I} and \frac{V}{I} have the same denominator, add them by adding their numerators.
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