Differentiate w.r.t. c
120
Evaluate
120c
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120c^{1-1}
The derivative of ax^{n} is nax^{n-1}.
120c^{0}
Subtract 1 from 1.
120\times 1
For any term t except 0, t^{0}=1.
120
For any term t, t\times 1=t and 1t=t.
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