Differentiate w.r.t. A_8
42A_{8}^{2}
Evaluate
14A_{8}^{3}
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\frac{\mathrm{d}}{\mathrm{d}A_{8}}(14A_{8}^{3})
Multiply 2 and 7 to get 14.
3\times 14A_{8}^{3-1}
The derivative of ax^{n} is nax^{n-1}.
42A_{8}^{3-1}
Multiply 3 times 14.
42A_{8}^{2}
Subtract 1 from 3.
14A_{8}^{3}
Multiply 2 and 7 to get 14.
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