Differentiate w.r.t. x
\frac{56}{x^{15}}
Evaluate
-\frac{4}{x^{14}}
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-14\left(-4\right)x^{-14-1}
The derivative of ax^{n} is nax^{n-1}.
56x^{-14-1}
Multiply -14 times -4.
56x^{-15}
Subtract 1 from -14.
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