Differentiate w.r.t. f
15
Evaluate
15f
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15f^{1-1}
The derivative of ax^{n} is nax^{n-1}.
15f^{0}
Subtract 1 from 1.
15\times 1
For any term t except 0, t^{0}=1.
15
For any term t, t\times 1=t and 1t=t.
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