Differentiate w.r.t. c
-420
Evaluate
-420c
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\frac{\mathrm{d}}{\mathrm{d}c}(-420c)
Combine -855c and 435c to get -420c.
-420c^{1-1}
The derivative of ax^{n} is nax^{n-1}.
-420c^{0}
Subtract 1 from 1.
-420
For any term t except 0, t^{0}=1.
-420c
Combine -855c and 435c to get -420c.
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