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Evaluate
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Differentiate w.r.t. x
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\frac{\left(-x^{-9}\right)x^{8}}{25}
Multiply x^{4} and x^{-4} to get 1.
\frac{-x^{-1}}{25}
To multiply powers of the same base, add their exponents. Add -9 and 8 to get -1.