Evaluate
\frac{64Is_{7}}{325}
Differentiate w.r.t. I
\frac{64s_{7}}{325}
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\frac{I\times 12.8s_{7}}{65}
Multiply 4 and 3.2 to get 12.8.
I\times \frac{64}{325}s_{7}
Divide I\times 12.8s_{7} by 65 to get I\times \frac{64}{325}s_{7}.
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