Differentiate w.r.t. x
-\frac{40}{x^{6}}
Evaluate
\frac{8}{x^{5}}
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-5\times 8x^{-5-1}
The derivative of ax^{n} is nax^{n-1}.
-40x^{-5-1}
Multiply -5 times 8.
-40x^{-6}
Subtract 1 from -5.
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