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Evaluate
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Differentiate w.r.t. A
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7^{-1}A^{-1}
Expand \left(7A\right)^{-1}.
\frac{1}{7}A^{-1}
Calculate 7 to the power of -1 and get \frac{1}{7}.
\frac{\mathrm{d}}{\mathrm{d}A}(7^{-1}A^{-1})
Expand \left(7A\right)^{-1}.
\frac{\mathrm{d}}{\mathrm{d}A}(\frac{1}{7}A^{-1})
Calculate 7 to the power of -1 and get \frac{1}{7}.
-\frac{1}{7}A^{-1-1}
The derivative of ax^{n} is nax^{n-1}.
-\frac{1}{7}A^{-2}
Subtract 1 from -1.