Differentiate w.r.t. a
-\frac{4}{a^{3}}
Evaluate
\frac{2}{a^{2}}
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\frac{\mathrm{d}}{\mathrm{d}a}(2a^{-2})
Combine a^{-2} and a^{-2} to get 2a^{-2}.
-2\times 2a^{-2-1}
The derivative of ax^{n} is nax^{n-1}.
-4a^{-2-1}
Multiply -2 times 2.
-4a^{-3}
Subtract 1 from -2.
2a^{-2}
Combine a^{-2} and a^{-2} to get 2a^{-2}.
Examples
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Limits
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