Differentiate w.r.t. x
\frac{240}{x^{3}}
Evaluate
-\frac{120}{x^{2}}
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-2\left(-120\right)x^{-2-1}
The derivative of ax^{n} is nax^{n-1}.
240x^{-2-1}
Multiply -2 times -120.
240x^{-3}
Subtract 1 from -2.
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