Differentiate w.r.t. c
-\frac{3}{25c^{4}}
Evaluate
\frac{1}{25c^{3}}
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-3\times \frac{1}{25}c^{-3-1}
The derivative of ax^{n} is nax^{n-1}.
-\frac{3}{25}c^{-3-1}
Multiply -3 times \frac{1}{25}.
-\frac{3}{25}c^{-4}
Subtract 1 from -3.
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